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, 1, 1), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.
A150087
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, 1, 1), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =66a(5) =243a(6) =929a(7) =3676a(8) =14808a(9) =60805a(10) =252986a(11) =1065589a(12) =4536809a(13) =19477581a(14) =84303710a(15) =367160122a(16) =1608825471a(17) =7085704233a(18) =31353847815a(19) =139335954645a(20) =621512821655
External references
- oeis: A150087