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, 0, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
A148702
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, 0, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =71a(6) =241a(7) =827a(8) =2969a(9) =10719a(10) =39869a(11) =149412a(12) =568421a(13) =2188494a(14) =8488370a(15) =33235585a(16) =131138445a(17) =520203906a(18) =2078395161a(19) =8342877038a(20) =33647604003a(21) =136384448249a(22) =554714145737
External references
- oeis: A148702