-43776

Appears in sequences

• arctanh(arctan(x)*arctan(x))=2/2!*x^2-16/4!*x^4+608/6!*x^6-43776/8!*x^8...at n=4A012464
• Reciprocal Chebyshev polynomial of second kind evaluated at 4 multiplied by (-1)^n.at n=8A025171
• a(n) = 4^n sin(nC)/sqrt(15), where B is the angle opposite side CA in a triangle ABC having sidelengths |BC|=2, |CA| = 3, |AB| = 4; ABC is the smallest integer-sided scalene triangle.at n=9A375885