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, 0), (-1, -1, 1), (-1, 0, 0), (0, -1, 0), (1, 1, 0)}.
A149503
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, 0), (-1, -1, 1), (-1, 0, 0), (0, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =143a(6) =555a(7) =1981a(8) =7477a(9) =28549a(10) =108961a(11) =426105a(12) =1662133a(13) =6568089a(14) =26088533a(15) =104028671a(16) =418100919a(17) =1683005799a(18) =6816895227a(19) =27676678867a(20) =112793176879a(21) =461118216915
External references
- oeis: A149503