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

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =21a(5) =41a(6) =74a(7) =126a(8) =196a(9) =314a(10) =448a(11) =672a(12) =912a(13) =1302a(14) =1692a(15) =2334a(16) =2937a(17) =3927a(18) =4828a(19) =6292a(20) =7579a(21) =9679a(22) =11466a(23) =14378a(24) =16808a(25) =20748a(26) =23968a(27) =29198a(28) =33388a(29) =40188