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), (0, 0, 1), (1, 0, -1), (1, 0, 0)}.
A149918
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), (0, 0, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =155a(6) =550a(7) =2035a(8) =7722a(9) =29985a(10) =118765a(11) =479168a(12) =1964860a(13) =8163456a(14) =34289654a(15) =145407531a(16) =622140088a(17) =2684352052a(18) =11668740663a(19) =51051121400a(20) =224634027148a(21) =993743689121
External references
- oeis: A149918