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A263871
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Number of (n+1)X(6+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nondecreasing.
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1
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4, 4, 14, 17, 93, 379, 2909, 20374, 121878, 785046, 3811314, 20729459, 86398810, 401508982, 1487808602, 6052744740, 20393912111, 74234335758, 230979488062, 765576270536, 2224840569660, 6807977828585, 18640043440258, 53237097603882
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