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)}.
A149654
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) =15a(4) =75a(5) =275a(6) =1375a(7) =5601a(8) =28005a(9) =121089a(10) =605445a(11) =2715677a(12) =13578385a(13) =62402157a(14) =312010785a(15) =1458538087a(16) =7292690435a(17) =34518363331a(18) =172591816655a(19) =824661140195
External references
- oeis: A149654