17314842634domain: NAppears in sequencesFirst differences of Chebyshev polynomials S(n,363) = A098251(n) with Diophantine property.at n=4A098253a(0) = 1, a(1) = 19; for n > 1, a(n) = 19*a(n-1) + a(n-2).at n=8A243399