Search: id:A148574
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%I A148574
%S A148574 1,1,3,6,20,49,172,484,1732,5194,19061,59840,222265,722995,2707778,9031024,
               34126550,116009638,
%T A148574 440855651,1523827413,5816083375,20364473133,78075605101,276294402102,
               1062737326830,
%U A148574 3796951739926,14643791215968,52733250282433,203923018220654,739335703065172,
               2865104006790009
%N A148574 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), (0, 1, -1), 
               (0, 1, 1), (1, 0, -1)}
%H A148574 A. Bostan and M. Kauers, 2008. Automatic Classification of Restricted 
               Lattice Walks, <a href="http://arxiv.org/abs/0811.2899">ArXiv 0811.2899</
               a>.
%t A148574 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, j, 1 + k, -1 + n] + aux[i, -1 
               + j, -1 + k, -1 + n] + aux[i, -1 + j, 1 + 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}]
%Y A148574 Sequence in context: A062164 A052408 A148573 this_sequence A005558 A138350 
               A148575
%Y A148574 Adjacent sequences: A148571 A148572 A148573 this_sequence A148575 A148576 
               A148577
%K A148574 nonn,walk
%O A148574 0,3
%A A148574 Manuel Kauers (manuel(AT)kauers.de), Nov 18 2008

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