Second elementary symmetric function of the first n terms of (1,4,16,64,256,...).

A203244

Second elementary symmetric function of the first n terms of (1,4,16,64,256,...).

Terms

    a(0) =4a(1) =84a(2) =1428a(3) =23188a(4) =372372a(5) =5963412a(6) =95436436a(7) =1527070356a(8) =24433475220a(9) =390937001620

External references