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 A200045 Number T(n,m) of ways of 4-coloring an n X m grid so that there is no rectangle with all 4 corners the same color. 3
 4, 16, 252, 64, 3912, 228984, 256, 59928, 12870096, 2545607472, 1024, 906912, 696448224, 465659203104, 272454472598400, 4096, 13571712, 36376835616, 79102304162784, 140221913588582784 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The rectangles have sides parallel to the x- and y-axes. LINKS EXAMPLE Triangle starts:      4;     16,    252;     64,   3912,    228984;    256,  59928,  12870096,   2545607472;   1024, 906912, 696448224, 465659203104, 272454472598400;   ... CROSSREFS Cf. A252778, A252780, A252839. Sequence in context: A333438 A232840 A113905 * A099202 A139288 A152921 Adjacent sequences:  A200042 A200043 A200044 * A200046 A200047 A200048 KEYWORD nonn,tabl,more AUTHOR Jason Davies, Nov 14 2011 EXTENSIONS T(6,5) from Jason Davies, Nov 08 2012 STATUS approved

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Last modified September 30 00:37 EDT 2020. Contains 337432 sequences. (Running on oeis4.)