Number of integer-sided polygons having perimeter n, modulo rotations but not reflections.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =19a(6) =43a(7) =75a(8) =155a(9) =287a(10) =567a(11) =1053a(12) =2063a(13) =3859a(14) =7455a(15) =14089a(16) =27083a(17) =51463a(18) =98855a(19) =188697a(20) =362675a(21) =695155a(22) =1338087a(23) =2573235a(24) =4962875a(25) =9571195a(26) =18496407a(27) =35759799a(28) =69240899a(29) =134154259