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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
A148640
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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =62a(6) =215a(7) =708a(8) =2509a(9) =8925a(10) =32078a(11) =118661a(12) =440178a(13) =1657992a(14) =6278939a(15) =24033464a(16) =92682133a(17) =358921659a(18) =1400617687a(19) =5489703720a(20) =21631282920a(21) =85549496243a(22) =339806449140
External references
- oeis: A148640