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, 1, 0), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
A150145
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, 1, 0), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =73a(5) =285a(6) =1148a(7) =4779a(8) =20334a(9) =88008a(10) =386678a(11) =1718210a(12) =7712724a(13) =34911184a(14) =159158001a(15) =730223827a(16) =3368483512a(17) =15614541300a(18) =72693167654a(19) =339721530052
External references
- oeis: A150145