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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
A149402
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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =51a(5) =190a(6) =842a(7) =3431a(8) =15654a(9) =67330a(10) =312993a(11) =1392581a(12) =6555426a(13) =29833990a(14) =141757524a(15) =655762121a(16) =3137841689a(17) =14692467913a(18) =70689773071a(19) =334087875481
External references
- oeis: A149402