The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A331452

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A331452

Triangle read by rows: T(n,m) (n >= m >= 1) = number of regions (or cells) formed by drawing the line segments connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares.
(history; published version)

#140 by N. J. A. Sloane at Sun Jan 08 01:07:48 EST 2023

STATUS

proposed

approved

#139 by Michael De Vlieger at Sat Jan 07 00:15:29 EST 2023

STATUS

editing

proposed

#138 by Michael De Vlieger at Sat Jan 07 00:15:16 EST 2023

KEYWORD

nonn,tabl,nice,changed

STATUS

approved

editing

#137 by N. J. A. Sloane at Sat Dec 31 23:20:46 EST 2022

STATUS

editing

approved

#136 by N. J. A. Sloane at Sat Dec 31 23:20:42 EST 2022

REFERENCES

Lars Blomberg, Scott R. Shannon, and N. J. A. Sloane, Graphical Enumeration and Stained Glass Windows, 1: Rectangular Grids, Integers, Ron Graham Memorial Volume 21A (2021), #A5. Also in book, "Number Theory and Combinatorics: A Collection in Honor of the Mathematics of Ronald Graham", ed. B. M. Landman et al., De Gruyter, 2022, pp. 65-97.

#135 by N. J. A. Sloane at Sat Dec 31 23:20:39 EST 2022

REFERENCES

STATUS

approved

editing

#134 by Joerg Arndt at Sun Dec 19 11:19:32 EST 2021

STATUS

reviewed

approved

#133 by Michel Marcus at Sun Dec 19 11:06:16 EST 2021

STATUS

proposed

reviewed

#132 by Jon E. Schoenfield at Sun Dec 19 09:12:09 EST 2021

STATUS

editing

proposed

#131 by Jon E. Schoenfield at Sun Dec 19 09:11:53 EST 2021

EXAMPLE

4,;

16, 56,;

46, 142, 340,;

104, 296, 608, 1120,;

214, 544, 1124, 1916, 3264,;

380, 892, 1714, 2820, 4510, 6264,;

648, 1436, 2678, 4304, 6888, 9360, 13968,;

1028, 2136, 3764, 6024, 9132, 12308, 17758, 22904,;

1562, 3066, 5412, 8126, 12396, 16592, 23604, 29374, 38748,;

2256, 4272, 7118, 10792, 16226, 20896, 29488, 36812, 47050, 58256,;

...

STATUS

approved

editing