91586127425domain: NAppears in sequencesSmaller sides (a) in (a,a,a+1)-integer triangle with integer area.at n=10A103974a(n) = 3*a(n-1) + 3*a(n-2) - a(n-3); a(0)=1, a(1)=1, a(2)=5.at n=20A120893Hypotenuses of Pythagorean triples in A195499 and A195503.at n=18A195531