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, 0, 1), (1, -1, 0), (1, 0, 0)}.
A149830
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, 0, 1), (1, -1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =85a(6) =282a(7) =961a(8) =3348a(9) =12090a(10) =44786a(11) =168404a(12) =643901a(13) =2505895a(14) =9858281a(15) =39170311a(16) =157508249a(17) =638763140a(18) =2608585552a(19) =10740130403a(20) =44524221312a(21) =185571516895a(22) =777920112939
External references
- oeis: A149830