-177792

Appears in sequences

• Expansion of Product_{k>=1} (1 + x^(2*k))^(2*k)/(1 + x^(2*k-1))^(2*k-1).at n=23A284474
• a(n) = 2^n*E2_{n}(-1/2) with E2_{n} the polynomials defined in A326480.at n=7A326484