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, 1, 1), (1, -1, 1), (1, 1, -1)}.
A149026
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, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =39a(5) =137a(6) =623a(7) =2441a(8) =11359a(9) =47521a(10) =224359a(11) =977861a(12) =4663291a(13) =20889033a(14) =100338007a(15) =458283489a(16) =2213130847a(17) =10255221601a(18) =49728217447a(19) =232997035357
External references
- oeis: A149026