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A235306
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Number of (n+1) X (4+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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1554, 2918, 5042, 10790, 21090, 49574, 107186, 269222, 629154, 1656998, 4101362, 11181350, 28857570, 80708774, 214757426, 612173222, 1666192674, 4817289638, 13336967282, 38965654310, 109297879650, 321784561574, 911836050866
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OFFSET
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1,1
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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:
5 2 5 2 5 2 5 1 5 0 4 0 4 1 4 1 4 1 4 0
0 3 0 3 0 5 2 4 2 3 1 3 1 4 1 3 0 3 0 2
3 0 3 0 3 2 5 1 5 0 4 0 4 1 4 1 4 1 4 0
1 4 1 4 1 3 0 2 0 1 0 2 0 3 0 4 1 4 1 3
4 1 4 1 4 2 5 1 5 0 4 0 4 1 4 2 5 2 5 1
0 3 0 3 0 3 0 2 0 1 0 2 0 3 0 4 1 4 1 3
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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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