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, 0, 1), (0, 1, 0), (1, -1, -1), (1, 1, 1)}.
A150520
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, 0, 1), (0, 1, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =103a(5) =434a(6) =1887a(7) =8340a(8) =37419a(9) =169974a(10) =779649a(11) =3606069a(12) =16784025a(13) =78569084a(14) =369536333a(15) =1745293573a(16) =8272862239a(17) =39339883900a(18) =187602333559a(19) =896904874283
External references
- oeis: A150520