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, 1), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
A149607
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, 1), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =63a(5) =217a(6) =987a(7) =3739a(8) =17041a(9) =67427a(10) =312401a(11) =1278837a(12) =5957503a(13) =24909735a(14) =116754341a(15) =496697033a(16) =2336947601a(17) =10068508359a(18) =47525309535a(19) =206915190169a(20) =979136680151
External references
- oeis: A149607