Question Number 125501 by mathmax by abdo last updated on 11/Dec/20
$$\mathrm{find}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:\sum_{\mathrm{n}=\mathrm{2}} ^{\infty} \:\:\frac{\left(−\mathrm{1}\right)^{\mathrm{n}} \left(\mathrm{2n}+\mathrm{1}\right)}{\mathrm{n}^{\mathrm{4}} −\mathrm{1}} \\ $$