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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A149018
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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =35a(5) =129a(6) =520a(7) =2099a(8) =8807a(9) =37088a(10) =159794a(11) =690849a(12) =3030304a(13) =13335930a(14) =59258020a(15) =264113060a(16) =1185147895a(17) =5332540349a(18) =24112886920a(19) =109297185243a(20) =497282246389
External references
- oeis: A149018