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, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148236
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, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =35a(6) =125a(7) =379a(8) =1410a(9) =4568a(10) =17355a(11) =58687a(12) =226060a(13) =787594a(14) =3063243a(15) =10908565a(16) =42712542a(17) =154643162a(18) =608400479a(19) =2231231403a(20) =8808890240a(21) =32636886464a(22) =129188068662a(23) =482614611622
External references
- oeis: A148236