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, 0, 0), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149660
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, 0, 0), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =59a(5) =239a(6) =995a(7) =3999a(8) =16717a(9) =72381a(10) =310285a(11) =1336973a(12) =5875781a(13) =25978769a(14) =114569141a(15) =509761121a(16) =2285807767a(17) =10256654727a(18) =46123726015a(19) =208655609019a(20) =946466452167
External references
- oeis: A149660