-264175616

Appears in sequences

• a(n) is the numerator of the imaginary part of 1/(1+i/2)^n, where i is the imaginary unit.at n=14A370192
• a(n) = 20^n * cos(n*A), where A is the angle opposite side BC in a triangle ABC having sidelengths |BC|=3, |CA|=4, |AB|=5; ABC is the smallest integer-sided right triangle.at n=7A376285