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, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148870
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, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =29a(5) =94a(6) =345a(7) =1279a(8) =5059a(9) =19688a(10) =79177a(11) =322253a(12) =1334084a(13) =5547509a(14) =23402949a(15) =99466276a(16) =425275371a(17) =1829109184a(18) =7928585175a(19) =34530360916a(20) =150984395695a(21) =663332004284
External references
- oeis: A148870