a(n) = A000085(n) * A000110(n).

Terms

a(0) =1a(1) =4a(2) =20a(3) =150a(4) =1352a(5) =15428a(6) =203464a(7) =3162960a(8) =55405140a(9) =1101298600a(10) =24222234720a(11) =590544046744