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, 0, 0), (-1, 0, 1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149771
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, 0, 0), (-1, 0, 1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =77a(5) =317a(6) =1361a(7) =6025a(8) =27163a(9) =122675a(10) =559209a(11) =2573479a(12) =11947959a(13) =55780987a(14) =261418223a(15) =1229568863a(16) =5807019993a(17) =27526376675a(18) =130867422041a(19) =623691585535
External references
- oeis: A149771