24540428881domain: NAppears in sequencesLarger of two sides in a (k,k,k-1)-integer-sided triangle with integer area.at n=9A103772a(n) = 3*a(n-1) + 3*a(n-2) - a(n-3); a(0)=1, a(1)=1, a(2)=5.at n=19A120893Hypotenuses of Pythagorean triples in A195499 and A195503.at n=17A195531