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, 1), (1, 0, -1), (1, 1, 1)}.
A149645
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, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =243a(6) =1181a(7) =4449a(8) =21873a(9) =86429a(10) =427333a(11) =1743085a(12) =8650451a(13) =36085927a(14) =179482499a(15) =761304079a(16) =3792222751a(17) =16294440361a(18) =81248029313a(19) =352719683805
External references
- oeis: A149645