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), (0, 1, 0), (1, 1, -1)}.
A149951
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), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =176a(6) =646a(7) =2452a(8) =9549a(9) =37961a(10) =153511a(11) =629732a(12) =2614885a(13) =10972374a(14) =46463260a(15) =198334111a(16) =852639288a(17) =3688754625a(18) =16049389276a(19) =70187680379a(20) =308375520541
External references
- oeis: A149951