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, 1), (-1, 1, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
A149423
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, 1), (-1, 1, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =56a(5) =211a(6) =1025a(7) =4307a(8) =21204a(9) =94266a(10) =467078a(11) =2145817a(12) =10669555a(13) =50053958a(14) =249384307a(15) =1186640955a(16) =5919439517a(17) =28450917045a(18) =142033418623a(19) =687720200014
External references
- oeis: A149423