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, 0, 1), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
A148336
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, 0, 1), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =44a(6) =152a(7) =538a(8) =1995a(9) =7662a(10) =29940a(11) =120398a(12) =491459a(13) =2038747a(14) =8581283a(15) =36510595a(16) =157045874a(17) =681735158a(18) =2982964821a(19) =13151583858a(20) =58359139202a(21) =260520699938
External references
- oeis: A148336