a(n) = Hermite(n, 21).A158727a(n) = Hermite(n, 21).Terms a(0) =1a(1) =42a(2) =1762a(3) =73836a(4) =3090540a(5) =129211992a(6) =5395998264a(7) =225081383184External referencesoeis: A158727