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A297433
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Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.
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1
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1, 3, 14, 26, 43, 109, 301, 649, 1332, 3124, 7545, 16925, 37301, 85611, 198538, 450262, 1014883, 2315761, 5303161, 12062833, 27380904, 62381096, 142295761, 323928537, 736878729, 1678132851, 3823284742, 8705263890, 19816325051, 45124192277
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