139025domain: NAppears in sequencesa(n) = T(n,n) + T(n,n+1) + ... + T(n,2n), T given by A027113.at n=11A027129Number of binary rooted trees with n nodes and height exactly 7.at n=22A036596Number of 2 X 2 matrices having all terms in {1,...,n} and positive determinant.at n=22A211059