Chebyshev T-polynomials T_n(18).A322889Chebyshev T-polynomials T_n(18).Terms a(0) =1a(1) =18a(2) =647a(3) =23274a(4) =837217a(5) =30116538a(6) =1083358151a(7) =38970776898External referencesoeis: A322889