Number of n-gons in cubic curve.

Terms

a(0) =24a(1) =54a(2) =216a(3) =648a(4) =2376a(5) =8100a(6) =29232a(7) =104544a(8) =381672a(9) =1397070a(10) =5163480a(11) =19170432a(12) =71587080a(13) =268423200a(14) =1010595960a(15) =3817704744a(16) =14467313448a(17) =54975424194a(18) =209430985176a(19) =799644248064