Computing the n-th Euler zigzag number

Computing the n-th Euler zigzag number A_n

A_2n = S_n if n ≥ 0;
A_2n-1 = T_n if n ≥ 1.

Here S_n is the nth secant number and T_n is the nth tangent number.

See Euler zigzag numbers and OEIS A000111.

Last modified 26th February 2023
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