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, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149916
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, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =155a(6) =535a(7) =1917a(8) =7009a(9) =26111a(10) =99101a(11) =381016a(12) =1480405a(13) =5811708a(14) =23018829a(15) =91810619a(16) =368562020a(17) =1488525491a(18) =6042748077a(19) =24642209677a(20) =100920566643a(21) =414918597849
External references
- oeis: A149916