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, 0, -1), (0, 1, 0), (1, -1, 1)}.
A148412
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, 0, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =57a(6) =199a(7) =713a(8) =2674a(9) =10267a(10) =40224a(11) =159836a(12) =643943a(13) =2624714a(14) =10812420a(15) =44937564a(16) =188217760a(17) =793760602a(18) =3368428829a(19) =14375082907a(20) =61660832974a(21) =265713000488
External references
- oeis: A148412