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, 0), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
A150059
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, 0), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =63a(5) =220a(6) =835a(7) =3154a(8) =12570a(9) =49819a(10) =205075a(11) =839526a(12) =3536313a(13) =14817881a(14) =63500843a(15) =270794862a(16) =1176087811a(17) =5084586904a(18) =22320018345a(19) =97564133595a(20) =432038519652
External references
- oeis: A150059