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, 0, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 0)}.
A149155
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, 0, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =39a(5) =112a(6) =512a(7) =1660a(8) =7778a(9) =27188a(10) =129401a(11) =475825a(12) =2288259a(13) =8728352a(14) =42284402a(15) =165826745a(16) =807712214a(17) =3237235537a(18) =15833338030a(19) =64579379484a(20) =316882110960
External references
- oeis: A149155