Formula_21169

\[\begin{gathered}H_{0}(x)=1, H_{1}(x)=2 x, H_{2}(x)=4 x^{2}-2, \\H_{3}(x)=8 x^{3}-12 x, \\H_{4}(x)=16 x^{4}-48 x^{2}+12, H_{5}(x)=32 x^{5}-160 x^{3}+120 x, \ldots\end{gathered}\]