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), (1, -1, 0), (1, 0, 1)}.
A149885
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), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =44a(5) =151a(6) =535a(7) =1966a(8) =7405a(9) =28505a(10) =111788a(11) =445140a(12) =1795088a(13) =7320770a(14) =30148959a(15) =125206603a(16) =523997043a(17) =2207912732a(18) =9359648685a(19) =39898730194a(20) =170940133097a(21) =735708995287
External references
- oeis: A149885