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, 1, -1), (1, -1, -1), (1, 1, 1)}.
A149502
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, 1, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =121a(6) =581a(7) =1817a(8) =8797a(9) =29313a(10) =142301a(11) =503977a(12) =2453477a(13) =8974977a(14) =43860725a(15) =165014649a(16) =808021149a(17) =3105881545a(18) =15244653845a(19) =59564679569a(20) =292834353069
External references
- oeis: A149502