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, -1), (1, 0, 0), (1, 0, 1)}.
A150457
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, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =95a(5) =390a(6) =1620a(7) =6965a(8) =30522a(9) =135385a(10) =610014a(11) =2771126a(12) =12705652a(13) =58683457a(14) =272604795a(15) =1273727257a(16) =5977473827a(17) =28170926189a(18) =133252922101a(19) =632302591304
External references
- oeis: A150457