856576domain: NAppears in sequencesG.f.: A(x) = Sum_{n>=0} 2^(n^2)*A000108(n)*(1-2^n*x)^n*x^n where A000108 is the Catalan numbers.at n=4A168554a(n) = 4^n cos(nC), where C is the angle opposite side AB in a triangle ABC having sidelengths |BC|=2, |CA| = 3, |AB| = 4; ABC is the smallest integer-sided scalene triangle.at n=10A375882