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, 0), (-1, 1, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148471
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, 0), (-1, 1, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =67a(6) =261a(7) =1043a(8) =4339a(9) =18503a(10) =80384a(11) =354740a(12) =1585917a(13) =7161755a(14) =32631452a(15) =149791796a(16) =691983065a(17) =3214568803a(18) =15005803890a(19) =70346777076a(20) =331038719877
External references
- oeis: A148471