Recently I tried to estimate this sum but without much success, would you have any methods to suggest?
$S=\sum_{n=1}^{+\infty} (-1)^n \frac{H_{2n}}{n^2}$
2026-03-25 06:04:02.1774418642
$\sum_{n=1}^{+\infty} (-1)^n \frac{H_{2n}}{n^2}$?
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