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A289650
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Number of nX7 0..1 arrays with the number of 1s horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0s adjacent to some 1.
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1
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3, 2421, 183390, 25760875, 2439241607, 332113863074, 35072966294346, 4615203834449304, 519140871714574338, 66784349259505575111, 7809000921229551589905, 991318340748862385457430
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