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, 0, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149682
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, 0, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =261a(6) =1119a(7) =4789a(8) =20925a(9) =91981a(10) =411389a(11) =1859025a(12) =8471171a(13) =38770881a(14) =178483711a(15) =826512465a(16) =3847717971a(17) =17976662233a(18) =84242272527a(19) =396035107669
External references
- oeis: A149682