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 A234665 T(n,k) is the number of (n+1) X (k+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). 7
 298, 1820, 1820, 11112, 9774, 11112, 68086, 52646, 52646, 68086, 417050, 286668, 250792, 286668, 417050, 2564388, 1566596, 1219652, 1219652, 1566596, 2564388, 15760606, 8659270, 5969944, 5359466, 5969944, 8659270, 15760606, 97264082 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts 298 1820 11112 68086 417050 2564388 1820 9774 52646 286668 1566596 8659270 11112 52646 250792 1219652 5969944 29828832 68086 286668 1219652 5359466 23814574 109044744 417050 1566596 5969944 23814574 96408730 406314140 2564388 8659270 29828832 109044744 406314140 1591037136 15760606 48048220 150093796 504872642 1736939430 6340767776 97264082 269752200 770712800 2403596054 7695605586 26370069748 599847168 1520415050 3987209216 11568505044 34563948112 3715680490 8671291020 21036841216 57131064334 LINKS R. H. Hardin, Table of n, a(n) for n = 1..97 FORMULA Empirical for column k: k=1: a(n) = 11*a(n-1) +17*a(n-2) -492*a(n-3) +1050*a(n-4) +1260*a(n-5). k=2: [order 16]. k=3: [order 39]. EXAMPLE Some solutions for n=2, k=4: 3 3 5 4 5 4 4 4 5 0 0 0 6 3 3 4 4 2 6 5 1 5 3 6 3 1 5 1 6 5 5 1 3 4 0 4 0 2 2 5 2 2 4 3 4 0 0 0 1 4 3 3 1 6 6 0 0 6 2 1 CROSSREFS Sequence in context: A200581 A200218 A284156 * A234659 A186126 A129037 Adjacent sequences: A234662 A234663 A234664 * A234666 A234667 A234668 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 29 2013 STATUS approved

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Last modified July 18 10:00 EDT 2024. Contains 374378 sequences. (Running on oeis4.)