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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A148918
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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =35a(5) =112a(6) =496a(7) =1801a(8) =8061a(9) =30928a(10) =142367a(11) =566479a(12) =2649839a(13) =10840297a(14) =51047381a(15) =212822362a(16) =1010052757a(17) =4271492413a(18) =20429029298a(19) =87421201652a(20) =420039660095
External references
- oeis: A148918