603641domain: NPropertiesPrimalityPrimeyesAppears in sequencesG.f. satisfies: A(x) = (1 + x*A(x)^2) * (1 + x*A(x)^3).at n=7A215654Number A(n,k) of hybrid k-ary trees with n internal nodes; square array A(n,k), n>=0, k>=1, read by antidiagonals.at n=52A245049Prime numbersat n=49373