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, 1, 1), (0, -1, 0), (0, 1, -1), (1, 0, 1)}.
A149441
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, 1, 1), (0, -1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =47a(5) =179a(6) =723a(7) =2955a(8) =12326a(9) =52379a(10) =225379a(11) =979595a(12) =4293370a(13) =18968055a(14) =84312906a(15) =376849710a(16) =1692411474a(17) =7633371175a(18) =34557396610a(19) =156972861920a(20) =715191169953
External references
- oeis: A149441