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), (0, 1, 1), (1, 0, 0)}.
A149850
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), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =46a(5) =144a(6) =540a(7) =2008a(8) =7290a(9) =28134a(10) =110656a(11) =428810a(12) =1693984a(13) =6849592a(14) =27500866a(15) =110897284a(16) =455131778a(17) =1867725934a(18) =7659244962a(19) =31746858056a(20) =132117155340a(21) =549012909864
External references
- oeis: A149850