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A235307
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Number of (n+1) X (5+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant-stress 1 X 1 tilings).
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1
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4006, 6786, 10790, 21090, 38182, 83394, 168998, 400674, 889126, 2238786, 5323430, 14015010, 35074342, 95480514, 248156198, 692867874, 1852387366, 5272270146, 14401045670, 41585674530, 115480062502, 337084349634, 948148162598
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 4*a(n-1) +25*a(n-2) -112*a(n-3) -231*a(n-4) +1260*a(n-5) +875*a(n-6) -7280*a(n-7) -224*a(n-8) +22736*a(n-9) -7980*a(n-10) -36288*a(n-11) +21456*a(n-12) +23040*a(n-13) -17280*a(n-14).
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EXAMPLE
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Some solutions for n=5:
1 4 1 4 1 5 4 0 4 0 4 1 2 4 1 5 2 4 2 5 2 5 1 5
3 0 3 0 3 1 2 4 2 4 2 5 4 0 3 1 4 0 5 2 5 2 4 2
1 4 1 4 1 5 5 1 5 1 5 2 1 3 0 4 1 3 2 5 2 5 1 5
5 2 5 2 5 3 0 2 0 2 0 3 4 0 3 1 4 0 3 0 3 0 2 0
0 3 0 3 0 4 5 1 5 1 5 2 1 3 0 4 1 3 2 5 2 5 1 5
4 1 4 1 4 2 2 4 2 4 2 5 5 1 4 2 5 1 3 0 3 0 2 0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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