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, 0, 1), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149723
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, 0, 1), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =285a(6) =1309a(7) =5515a(8) =25679a(9) =112633a(10) =530845a(11) =2393671a(12) =11381751a(13) =52290385a(14) =250260427a(15) =1165119535a(16) =5604533791a(17) =26355813965a(18) =127289400889a(19) =603273589021
External references
- oeis: A149723