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, -1, 1), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
A148903
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, -1, 1), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =101a(6) =417a(7) =1473a(8) =6355a(9) =23885a(10) =104937a(11) =411589a(12) =1836969a(13) =7422031a(14) =33475041a(15) =138309499a(16) =629036675a(17) =2644169269a(18) =12104444055a(19) =51586010082a(20) =237407217744
External references
- oeis: A148903