Number of paths of length n in the first quadrant, starting at the origin and consisting of 2 kinds of upsteps U=(1,1) (U1 and U2), 3 kinds of flatsteps F=(1,0) (F1, F2 and F3) and 1 kind of downsteps D=(1,-1).
A134425
Number of paths of length n in the first quadrant, starting at the origin and consisting of 2 kinds of upsteps U=(1,1) (U1 and U2), 3 kinds of flatsteps F=(1,0) (F1, F2 and F3) and 1 kind of downsteps D=(1,-1).
Terms
- a(0) =1a(1) =5a(2) =27a(3) =151a(4) =861a(5) =4969a(6) =28911a(7) =169187a(8) =994329a(9) =5862925a(10) =34658691a(11) =205305423a(12) =1218183669a(13) =7238062641a(14) =43055682327a(15) =256365292443
External references
- oeis: A134425