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, 0), (-1, 1, 1), (0, 1, 0), (1, 0, 0)}.
A149931
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, 0), (-1, 1, 1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =165a(6) =574a(7) =2096a(8) =7770a(9) =29093a(10) =111299a(11) =432096a(12) =1686763a(13) =6643900a(14) =26470088a(15) =106027415a(16) =426480004a(17) =1727954672a(18) =7039352696a(19) =28758827564a(20) =117983800177a(21) =486309061479
External references
- oeis: A149931