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, 0)}.
A149489
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, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =14a(4) =52a(5) =209a(6) =860a(7) =3611a(8) =15470a(9) =67075a(10) =293936a(11) =1299135a(12) =5782369a(13) =25890073a(14) =116507143a(15) =526584341a(16) =2389109731a(17) =10875671609a(18) =49655540621a(19) =227316843705
External references
- oeis: A149489