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, 0), (-1, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149546
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, 0), (-1, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =55a(5) =183a(6) =819a(7) =2879a(8) =13133a(9) =49151a(10) =226067a(11) =872789a(12) =4051349a(13) =16053849a(14) =74860243a(15) =302223013a(16) =1415920713a(17) =5801955375a(18) =27265975349a(19) =113089016787a(20) =532974688093
External references
- oeis: A149546