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), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
A149400
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), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =51a(5) =187a(6) =828a(7) =3392a(8) =15582a(9) =67025a(10) =312769a(11) =1393236a(12) =6588826a(13) =29978985a(14) =143025403a(15) =661778961a(16) =3177477385a(17) =14873762054a(18) =71793720043a(19) =339223544275
External references
- oeis: A149400