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, -1), (0, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149579
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, -1), (0, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =51a(5) =211a(6) =817a(7) =3079a(8) =13389a(9) =54809a(10) =220007a(11) =973339a(12) =4116547a(13) =17086809a(14) =76513949a(15) =330153771a(16) =1400440409a(17) =6324959359a(18) =27671023795a(19) =119172354919a(20) =541697331769
External references
- oeis: A149579