a(n) = (n+1)*A000521(n), n>(-1).A161557a(n) = (n+1)*A000521(n), n>(-1).Terms a(0) =1a(1) =744a(2) =393768a(3) =64481280a(4) =3457199880a(5) =101229281280External referencesoeis: A161557