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, 1, 0), (1, 0, 0)}.
A149926
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, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =163a(6) =586a(7) =2160a(8) =8143a(9) =31249a(10) =122003a(11) =482213a(12) =1924812a(13) =7746184a(14) =31413375a(15) =128260561a(16) =526691085a(17) =2173416903a(18) =9007876762a(19) =37483502040a(20) =156541737992a(21) =655875059098
External references
- oeis: A149926