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, -1)}.
A150015
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, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =66a(5) =240a(6) =960a(7) =3868a(8) =15717a(9) =66099a(10) =278019a(11) =1184631a(12) =5122091a(13) =22145476a(14) =96822325a(15) =426006332a(16) =1877617552a(17) =8342165233a(18) =37163619077a(19) =166066819583a(20) =745941334923
External references
- oeis: A150015