Euler E
From specialfunctionswiki
The Euler polynomials $E_n(x)$ are orthogonal polynomials defined by $$\dfrac{2e^{xt}}{e^t+1} = \sum_{k=0}^{\infty} \dfrac{E_n(x)t^n}{n!}.$$
The Euler polynomials $E_n(x)$ are orthogonal polynomials defined by $$\dfrac{2e^{xt}}{e^t+1} = \sum_{k=0}^{\infty} \dfrac{E_n(x)t^n}{n!}.$$