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), (1, 1, 0), (1, 1, 1)}.
A150921
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), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =33a(4) =145a(5) =620a(6) =2767a(7) =12458a(8) =56879a(9) =261838a(10) =1216407a(11) =5678117a(12) =26682723a(13) =125847796a(14) =596177017a(15) =2833553145a(16) =13508052345a(17) =64572800642a(18) =309401003271
External references
- oeis: A150921