来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a148802 Showing 1-1 of 1 %I A148802 %S A148802 1,1,3,8,26,80,277,930,3318,11643,42412,152958,565237,2075930,7753263, %T A148802 28843854,108607503,407906636,1545829275,5848333453,22278963147, %U A148802 84775245709,324339392219,1239936468371,4760994836197,18271315079302,70372359435245,270943377363634,1046308088337600,4039544714639796πn A148802在N ^ 3(第一个八分位的Z^ 3)开始的行进数在(0,0,0)开始,并且由从{(-1, 0, 1),(0,-1, 1),(0, 1,-1),(1, 0, 1)} %AH 88802 A. Bostan和M. Kauers,2008所取的n个步骤组成。受限网格行走的自动分类ARXIV 811.2899. %t A148802 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, j, -1 + k, -1 + n]]; Table[Sum[aux[i, j, k, n], {i, 0, n}, {j, 0, n},{k,0,n},{n,0, 10 } k %A148802 NON,Wave%%O A148802 0,3%%A148802MaunelKaulss],11月18日2008‰的内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证