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), (0, 1, 0), (1, 0, -1), (1, 1, 0)}.
A150090
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), (0, 1, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =66a(5) =243a(6) =930a(7) =3677a(8) =14911a(9) =61634a(10) =259234a(11) =1105147a(12) =4767937a(13) =20782106a(14) =91385250a(15) =405000507a(16) =1807317447a(17) =8114777154a(18) =36636893847a(19) =166234252180a(20) =757672572779
External references
- oeis: A150090