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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149729
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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =289a(6) =1329a(7) =5635a(8) =26397a(9) =116593a(10) =552593a(11) =2506239a(12) =11979623a(13) =55316481a(14) =266066767a(15) =1244457787a(16) =6014193317a(17) =28401812231a(18) =137771141551a(19) =655491800229
External references
- oeis: A149729