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), (0, 1, 1), (1, -1, -1)}.
A149873
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), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =491a(7) =1734a(8) =6592a(9) =24830a(10) =96763a(11) =378378a(12) =1522997a(13) =6125484a(14) =24995807a(15) =102864877a(16) =427821311a(17) =1785014345a(18) =7503833522a(19) =31780141158a(20) =135203016714a(21) =577262116273
External references
- oeis: A149873