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A143246
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Number of (directed) Hamiltonian circuits in the n X n grid graph.
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1
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0, 2, 0, 12, 0, 2144, 0, 9277152, 0, 934520913216, 0, 2152453777211211412, 0, 112252999240982874562527216, 0, 131765033045251672652319572331061144, 0, 3467852755777932367855581588111341658695967892, 0
(list; graph; refs; listen; history; internal format)
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