12506267433domain: NAppears in sequencesa(n) = 4*a(n-1) - a(n-2) for n>1, a(0)=3, a(1)=9.at n=17A082841a(n) = 4*a(n-2) - a(n-4).at n=34A083336Diagonals of a Euclidian solid such that there exists a Pythagorean quadruple d^2=a^2+b^2+c^2 that is more cube-like than any prior value of d.at n=25A375098