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), (1, 0, 1), (1, 1, 0), (1, 1, 1)}.
A151216
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), (1, 0, 1), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =55a(4) =261a(5) =1187a(6) =5759a(7) =27095a(8) =132851a(9) =636321a(10) =3138695a(11) =15198591a(12) =75244035a(13) =367002649a(14) =1821354023a(15) =8928746157a(16) =44386359817a(17) =218398906669
External references
- oeis: A151216