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, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.
A149208
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, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =40a(5) =131a(6) =543a(7) =1995a(8) =8492a(9) =33265a(10) =144245a(11) =588503a(12) =2586676a(13) =10852579a(14) =48195518a(15) =206354186a(16) =923882538a(17) =4016849256a(18) =18102778754a(19) =79653690932a(20) =360933654486
External references
- oeis: A149208