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, 0), (-1, 1, -1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149587
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, 0), (-1, 1, -1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =55a(5) =215a(6) =881a(7) =3499a(8) =14705a(9) =62815a(10) =267691a(11) =1152031a(12) =5054975a(13) =22215495a(14) =97820089a(15) =435083549a(16) =1946783755a(17) =8714538577a(18) =39182038837a(19) =177168174583a(20) =802527055581
External references
- oeis: A149587