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, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
A148456
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, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =55a(6) =187a(7) =665a(8) =2404a(9) =8914a(10) =33984a(11) =131733a(12) =517871a(13) =2062976a(14) =8320703a(15) =33890091a(16) =139284855a(17) =577018589a(18) =2408280217a(19) =10116043988a(20) =42749394792a(21) =181625736257a(22) =775565368155
External references
- oeis: A148456