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, 0), (1, 0, -1), (1, 0, 1)}.
A150272
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, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =91a(5) =388a(6) =1703a(7) =7660a(8) =34923a(9) =160928a(10) =749625a(11) =3520625a(12) =16630720a(13) =78987346a(14) =376981894a(15) =1805927651a(16) =8678665702a(17) =41831396697a(18) =202142233159a(19) =978882886268
External references
- oeis: A150272