-56448

Appears in sequences

• sech(tanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-90/6!*x^6+420/7!*x^7...at n=9A012658
• Fourier coefficients of E_{0,4}.at n=15A035016
• Signed double Pochhammer triangle: expansion of x(x-2)(x-4)..(x-2n+2).at n=22A039683
• Triangle formed by coefficients of the expansion of p(x, n), where p(x,n) = (1 + 2*x - x^2)^(n + 1)*Sum_{j >= 0} (j+1)^n*(-2*x + x^2)^j.at n=42A156901