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A194992
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Number of lower triangles of an nXn 0..2 array with each element differing from all of its horizontal and vertical neighbors by one
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1
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3, 6, 20, 80, 576, 4608, 69632, 1114112, 34603008, 1107296256, 69793218560, 4466765987840, 567347999932416, 72620543991349248, 18518801667747479552, 4740813226943354765312, 2422574005712127994626048
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