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, 0, 0), (0, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, -1)}.
A148818
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, 0, 0), (0, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =89a(6) =318a(7) =1179a(8) =4496a(9) =17509a(10) =69447a(11) =279660a(12) =1140251a(13) =4700604a(14) =19562165a(15) =82080374a(16) =346945287a(17) =1476050901a(18) =6316320356a(19) =27171754157a(20) =117444283946a(21) =509831752711
External references
- oeis: A148818