229705domain: NAppears in sequencesa(n) = Sum_{k=0..n} binomial(2*n-2*k,n-k)^2 * binomial(n,k)^2.at n=5A036916Number of degree-n permutations with pairwise coprime cycle lengths.at n=9A079129Number A(n,k) of up-down sequences with k copies each of 1,2,...,n; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=49A275784