Polynomially Interpolated Legendre Multiplier Sequences

Abstract: We prove that every multiplier sequence for the Legendre basis which can be interpolated by a polynomial has the form ${h(k^2+k)}_{k=0}^{\infty}$, where $h\in\mathbb{R}[x]$. We also prove that a non-trivial collection of polynomials of a certain form interpolate multiplier sequences for the Legendre basis, and we state conjectures on how to extend these results.