Number of involutions of length 2n which are invariant under the reverse-complement map and have no decreasing subsequences of length 8.

A145870

Number of involutions of length 2n which are invariant under the reverse-complement map and have no decreasing subsequences of length 8.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =20a(4) =75a(5) =301a(6) =1287a(7) =5762a(8) =26875a(9) =129520a(10) =642452a(11) =3264834a(12) =16950089a(13) =89646090a(14) =482012650a(15) =2629809994a(16) =14537429823a(17) =81313943942a(18) =459705628930

External references