Third differences of ninth powers (A001017).

Terms

a(0) =1a(1) =509a(2) =18150a(3) =204630a(4) =1225230a(5) =4985070a(6) =15717750a(7) =41436870a(8) =95750430a(9) =200038110a(10) =385991430a(11) =698516790a(12) =1199001390a(13) =1968942030a(14) =3113936790a(15) =4768039590a(16) =7098477630a(17) =10310731710a(18) =14653979430a(19) =20426901270