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, 0), (-1, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149608
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, 0), (-1, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =63a(5) =217a(6) =999a(7) =3757a(8) =17793a(9) =69809a(10) =334365a(11) =1361721a(12) =6570421a(13) =27323139a(14) =132784185a(15) =561952215a(16) =2743176341a(17) =11766979961a(18) =57626807759a(19) =249837943569
External references
- oeis: A149608