a(n) = 2^n*A122705(n).A185182a(n) = 2^n*A122705(n).Terms a(0) =2a(1) =4a(2) =56a(3) =1056a(4) =25152a(5) =721792a(6) =24242048a(7) =934070016a(8) =40677025792External referencesoeis: A185182