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, 1), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.
A150091
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, 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) =934a(7) =3702a(8) =14991a(9) =61728a(10) =257760a(11) =1089242a(12) =4650510a(13) =20029566a(14) =86912034a(15) =379572697a(16) =1667173042a(17) =7359859750a(18) =32638991596a(19) =145339269594a(20) =649585008500
External references
- oeis: A150091