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, 0, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
A150153
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, 0, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =286a(6) =1156a(7) =4802a(8) =20424a(9) =88416a(10) =388558a(11) =1728154a(12) =7766068a(13) =35203756a(14) =160780734a(15) =739100904a(16) =3417064694a(17) =15877515930a(18) =74106064750a(19) =347262568828
External references
- oeis: A150153