DLMF:24.7.E6 (Q7482)

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DLMF:24.7.E6
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    E 2 n = ( - 1 ) n 2 2 n + 1 0 t 2 n sech ( π t ) d t . Euler-number-E 2 𝑛 superscript 1 𝑛 superscript 2 2 𝑛 1 superscript subscript 0 superscript 𝑡 2 𝑛 𝜋 𝑡 𝑡 {\displaystyle{\displaystyle E_{2n}=(-1)^{n}2^{2n+1}\int_{0}^{\infty}t^{2n}% \operatorname{sech}\left(\pi t\right)\mathrm{d}t.}}
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