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, -1, 1), (0, 1, -1), (1, 1, 1)}.
A149615
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, -1, 1), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =63a(5) =243a(6) =1019a(7) =4273a(8) =18309a(9) =79537a(10) =347953a(11) =1540517a(12) =6848389a(13) =30699769a(14) =138103437a(15) =624792087a(16) =2835583031a(17) =12920696755a(18) =59038536867a(19) =270570671015
External references
- oeis: A149615