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, 1), (1, 1, 0)}.
A150772
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, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =128a(5) =555a(6) =2481a(7) =11293a(8) =52078a(9) =242765a(10) =1140760a(11) =5397133a(12) =25670754a(13) =122666597a(14) =588385983a(15) =2831555505a(16) =13665200080a(17) =66110756518a(18) =320526990023
External references
- oeis: A150772