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, -1, -1), (1, 1, 1)}.
A150688
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, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =26a(4) =116a(5) =454a(6) =2100a(7) =8894a(8) =41900a(9) =185078a(10) =881964a(11) =4001456a(12) =19216082a(13) =88779108a(14) =428727854a(15) =2006723990a(16) =9731848516a(17) =45999286078a(18) =223817580500
External references
- oeis: A150688