-580194727

Appears in sequences

• a(n) = 2^(n+1)*cos(n*arctan(sqrt(15))).at n=30A272931
• a(n) = 2^(3n+1)*cos(nB), 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=10A375881