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Search: id:A137725
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| A137725 |
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Number of sequences of length n with elements {-2,-1,+1,+2}, such that the sum of elements of the whole sequence but of no proper subsequence equals 0 modulo n. For n>=4, the number of Hamiltonian (directed) circuits on the circulant graph C_n(1,2). |
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+0
3
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| 4, 4, 16, 18, 24, 32, 46, 58, 82, 112, 158, 220, 316, 450, 650, 938, 1364, 1982, 2892, 4220, 6170, 9022, 13206, 19332, 28314, 41472, 60760, 89022, 130446, 191150, 280120, 410506, 601600, 881656, 1292102, 1893634, 2775226, 4067256, 5960822, 8735972, 12803156, 18763898, 27499794, 40302866, 59066684
(list; graph; listen)
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