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, 0, 1), (1, 1, -1)}.
A149023
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, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =38a(5) =129a(6) =584a(7) =2194a(8) =10145a(9) =40267a(10) =189947a(11) =778149a(12) =3720871a(13) =15595032a(14) =75220900a(15) =320698025a(16) =1556317242a(17) =6722501137a(18) =32773080055a(19) =143032577776a(20) =699766105474
External references
- oeis: A149023