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, 0, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148460
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, 0, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =59a(6) =210a(7) =767a(8) =2901a(9) =11295a(10) =44756a(11) =180348a(12) =738130a(13) =3057350a(14) =12789793a(15) =54032745a(16) =230170481a(17) =987155382a(18) =4262047055a(19) =18511560553a(20) =80808289797a(21) =354440593530
External references
- oeis: A148460