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A235101
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Number of (n+1) X (2+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).
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1
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670, 2498, 9328, 35354, 135254, 523532, 2047890, 8097130, 32339728, 130423938, 530742334, 2177937580, 9005319178, 37492012258, 157045852768, 661404560282, 2798723937382, 11891816958860, 50708771987330, 216898348529434
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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) = 12*a(n-1) -14*a(n-2) -322*a(n-3) +949*a(n-4) +3384*a(n-5) -12901*a(n-6) -21740*a(n-7) +86236*a(n-8) +107744*a(n-9) -322761*a(n-10) -412538*a(n-11) +641088*a(n-12) +1018740*a(n-13) -478292*a(n-14) -1306432*a(n-15) -247248*a(n-16) +584736*a(n-17) +372096*a(n-18) +65664*a(n-19).
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EXAMPLE
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Some solutions for n=5:
5 3 2 4 6 4 1 4 6 1 4 6 3 1 3 1 3 6 2 0 2
0 2 5 3 1 3 4 3 1 3 2 0 4 6 4 6 4 3 3 5 3
6 4 3 1 3 1 6 1 3 1 4 6 5 3 5 3 5 0 4 2 4
1 3 6 0 6 0 3 2 0 4 3 1 3 5 3 6 4 3 6 0 6
6 4 3 3 5 3 6 1 3 6 1 3 0 6 0 3 5 0 5 3 5
3 5 0 4 2 4 5 4 2 1 0 6 2 4 2 0 6 5 4 6 4
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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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