I want to find the closed forms of the following Euler type sums
$$\sum\limits_{n=1}^\infty \frac{H_n}{n^p\binom{2n}{n}}4^n$$ and $$\sum\limits_{n=1}^\infty \frac{H_{2n}}{n^p\binom{2n}{n}}4^n.$$
A similar result please see A Challenging Euler Sum $\sum\limits_{n=1}^\infty \frac{H_n}{\tbinom{2n}{n}}$.
By Mathematica,
the following equations seems to be true
$$\sum\limits_{n=1}^\infty \frac{H_n}{n^2\binom{2n}{n}}4^n=\pi^2\log(2)+\frac{7}{2}\zeta(3)$$
and
$$\sum\limits_{n=1}^\infty \frac{H_{2n}}{n^2\binom{2n}{n}}4^n=\frac{1}{2}\pi^2\log(2)+\frac{35}{4}\zeta(3).$$
How to find their closed forms for general $p=0,1,2,3,\ldots$?
2026-03-25 17:29:50.1774459790
Two Euler type sums involving binomial coefficient and harmonic number
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