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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
A149476
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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =56a(5) =226a(6) =993a(7) =4387a(8) =19921a(9) =91299a(10) =424146a(11) =1984585a(12) =9359316a(13) =44377511a(14) =211482643a(15) =1011882904a(16) =4858879581a(17) =23401436915a(18) =113006754137a(19) =546971963058
External references
- oeis: A149476