EN
Given 0 < p,q < ∞ and any sequence z = {zₙ} in the unit disc 𝔻, we define an operator from functions on 𝔻 to sequences by $T_{z,p}(f) = {(1-|zₙ|²)^{1/p}f(zₙ)}$. Necessary and sufficient conditions on {zₙ} are given such that $T_{z,p}$ maps the Hardy space $H^{p}$ boundedly into the sequence space $ℓ^{q}$. A corresponding result for Bergman spaces is also stated.