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 A332608 Number of pentagons in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares). 4
 0, 0, 4, 12, 24, 28, 80, 128, 112, 200, 236, 356, 472, 652, 656, 940, 1040, 1300, 1600, 1948, 2048, 2588, 2856, 3260, 3716, 4492, 4572, 5324, 5904, 6508, 7200, 8144, 8664, 10296, 10548, 11664, 12580, 13860, 14596, 15980, 17312, 18516, 19692, 22152, 22912 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS See A331452 (the illustrations for T(n,2)) for pictures of these graphs. LINKS Lars Blomberg, Table of n, a(n) for n = 1..100 Scott R. Shannon, Data specifically for nX2 (or 2Xn) rectangles CROSSREFS Cf. A331452, A331453, A331454, A331763, A331765, A331766, A332599, A332600, A331457, A332606, A332607, A332609. Sequence in context: A274187 A353991 A286040 * A177464 A316985 A353789 Adjacent sequences: A332605 A332606 A332607 * A332609 A332610 A332611 KEYWORD nonn AUTHOR Scott R. Shannon and N. J. A. Sloane, Mar 12 2020 EXTENSIONS a(21) and beyond from Lars Blomberg, Apr 28 2020 STATUS approved

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Last modified June 12 18:11 EDT 2024. Contains 373359 sequences. (Running on oeis4.)