Number of integer-sided polygons having perimeter n, modulo rotations and reflections.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =16a(6) =32a(7) =54a(8) =102a(9) =180a(10) =336a(11) =607a(12) =1144a(13) =2098a(14) =3960a(15) =7397a(16) =14022a(17) =26452a(18) =50404a(19) =95821a(20) =183322a(21) =350554a(22) =673044a(23) =1292634a(24) =2489502a(25) =4797694a(26) =9264396a(27) =17904220a(28) =34652962a(29) =67125898