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), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148662
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), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =25a(5) =69a(6) =297a(7) =919a(8) =4209a(9) =14330a(10) =66413a(11) =237589a(12) =1127925a(13) =4224288a(14) =20166864a(15) =77647110a(16) =375206178a(17) =1483748803a(18) =7192465521a(19) =28949796874a(20) =141317035936a(21) =578798473432
External references
- oeis: A148662