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), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149757
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), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =85a(5) =343a(6) =1715a(7) =7501a(8) =37505a(9) =171085a(10) =855425a(11) =3999601a(12) =19998005a(13) =94992091a(14) =474960455a(15) =2280616019a(16) =11403080095a(17) =55180159045a(18) =275900795225
External references
- oeis: A149757