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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149364
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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =44a(5) =168a(6) =690a(7) =2854a(8) =12137a(9) =52565a(10) =230978a(11) =1027736a(12) =4618934a(13) =20940759a(14) =95652631a(15) =439609712a(16) =2032093808a(17) =9437604683a(18) =44029824803a(19) =206186450321a(20) =969017501835
External references
- oeis: A149364