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), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.
A150815
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), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =31a(4) =135a(5) =595a(6) =2717a(7) =12528a(8) =58626a(9) =276350a(10) =1312487a(11) =6264541a(12) =30039360a(13) =144544510a(14) =697680731a(15) =3376089128a(16) =16373450997a(17) =79560030026a(18) =387242778625
External references
- oeis: A150815