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), (0, -1, 0), (0, 1, -1), (0, 1, 0), (1, 1, 1)}.
A150840
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), (0, -1, 0), (0, 1, -1), (0, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =138a(5) =604a(6) =2703a(7) =12315a(8) =56663a(9) =263196a(10) =1230758a(11) =5788966a(12) =27366503a(13) =129887780a(14) =618733335a(15) =2956325427a(16) =14163969859a(17) =68023437777a(18) =327380888885
External references
- oeis: A150840