a(n) = (n!)^2 + n! + 1.A066142a(n) = (n!)^2 + n! + 1.Terms a(0) =3a(1) =3a(2) =7a(3) =43a(4) =601a(5) =14521a(6) =519121a(7) =25406641a(8) =1625742721a(9) =131682257281External referencesoeis: A066142