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), (-1, 0, -1), (0, 1, 1), (1, 0, 0)}.
A149851
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), (-1, 0, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =46a(5) =154a(6) =578a(7) =2056a(8) =7734a(9) =29832a(10) =113786a(11) =448286a(12) =1762158a(13) =6982215a(14) =28034055a(15) =112599212a(16) =456160196a(17) =1855679003a(18) =7575193160a(19) =31073949234a(20) =127882427241a(21) =528025970306
External references
- oeis: A149851