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, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149634
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, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =229a(6) =1103a(7) =4123a(8) =20063a(9) =78141a(10) =383261a(11) =1547761a(12) =7628147a(13) =31532753a(14) =155942825a(15) =656344887a(16) =3253277131a(17) =13881923067a(18) =68926594631a(19) =297404679961
External references
- oeis: A149634