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), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
A149431
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), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =45a(5) =171a(6) =689a(7) =2756a(8) =11351a(9) =47976a(10) =204381a(11) =878826a(12) =3824025a(13) =16776688a(14) =74021638a(15) =328681019a(16) =1467532698a(17) =6581442360a(18) =29637099404a(19) =133969162219a(20) =607582367783
External references
- oeis: A149431