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, 1, 1), (0, -1, 0), (1, 0, 0), (1, 1, -1)}.
A148736
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, 1, 1), (0, -1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =84a(6) =321a(7) =1227a(8) =4914a(9) =19934a(10) =82989a(11) =349811a(12) =1498388a(13) =6484077a(14) =28361043a(15) =125070229a(16) =555952836a(17) =2487523158a(18) =11199379630a(19) =50690294588a(20) =230576659493
External references
- oeis: A148736