Number of free hexagonal polygons of symmetry class D_(2h) and area n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =3a(7) =6a(8) =7a(9) =11a(10) =14a(11) =21a(12) =23a(13) =41a(14) =50a(15) =80a(16) =94a(17) =156a(18) =189a(19) =310a(20) =365a(21) =615a(22) =748a(23) =1237a(24) =1459a(25) =2488a(26) =3023a(27) =5059a(28) =5994a(29) =10296