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, 0), (-1, 1, 0), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149352
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, 0), (-1, 1, 0), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =157a(6) =637a(7) =2501a(8) =10164a(9) =42658a(10) =180400a(11) =764722a(12) =3307143a(13) =14430374a(14) =62996763a(15) =276911209a(16) =1228976451a(17) =5469146618a(18) =24404767964a(19) =109552267142a(20) =493669549335
External references
- oeis: A149352