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Search: id:A149301
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| A149301 |
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Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)} |
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+0
1
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| 1, 1, 4, 11, 46, 168, 731, 2979, 13401, 57661, 265461, 1181726, 5522830, 25155711, 118893172, 550284353, 2622755672, 12286768851, 58931031929, 278651004826, 1343265798651, 6397648075135, 30966476881123, 148352084091735, 720436718946511, 3467981145821313, 16888078807378942, 81615427515075795
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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A. Bostan and M. Kauers, 2008. Automatic Classification of Restricted Lattice Walks, ArXiv 0811.2899.
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MATHEMATICA
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aux[i_Integer, j_Integer, k_Integer, n_Integer] := Which[Min[i, j, k, n] < 0 || Max[i, j, k] > n, 0, n == 0, KroneckerDelta[i, j, k, n], True, aux[i, j, k, n] = aux[-1 + i, -1 + j, k, -1 + n] + aux[-1 + i, j, 1 + k, -1 + n] + aux[-1 + i, 1 + j, -1 + k, -1 + n] + aux[1 + i, -1 + j, k, -1 + n] + aux[1 + i, 1 + j, -1 + k, -1 + n]]; Table[Sum[aux[i, j, k, n], {i, 0, n}, {j, 0, n}, {k, 0, n}], {n, 0, 10}]
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CROSSREFS
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Sequence in context: A149298 A149299 A149300 this_sequence A149302 A149303 A053882
Adjacent sequences: A149298 A149299 A149300 this_sequence A149302 A149303 A149304
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KEYWORD
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nonn,walk
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AUTHOR
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Manuel Kauers (manuel(AT)kauers.de), Nov 18 2008
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