a(n) = A001911(n)*A003266(n+2).A359458a(n) = A001911(n)*A003266(n+2).Terms a(0) =0a(1) =2a(2) =18a(3) =180a(4) =2640a(5) =59280a(6) =2096640a(7) =118067040a(8) =10659448800External referencesoeis: A359458