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A302279
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Number of 2 X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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4
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0, 3, 7, 10, 27, 45, 98, 193, 379, 778, 1523, 3085, 6138, 12281, 24603, 49106, 98363, 196557, 393234, 786481, 1572731, 3145946, 6291203, 12583117, 25165802, 50331369, 100663963, 201325602, 402654283, 805305613, 1610612610, 3221227041
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = a(n-1) + 3*a(n-2) - 4*a(n-4) for n > 5.
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EXAMPLE
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Some solutions for n=5:
0 1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 1 0 0
1 0 0 1 1 0 1 1 0 0 0 1 1 1 0 0 0 1 1 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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