592939382485domain: NAppears in sequencesExpansion of (1 + 5*x - 12*x^2 - 80*x^3)/(1 - 33*x^2 + 272*x^4).at n=19A097113A sequence a(n) such that a(n+1)^2 - a(n)^2 are perfect squares.at n=19A180313