Number of fusenes with n hexagons.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =82a(6) =339a(7) =1505a(8) =7036a(9) =33836a(10) =166246a(11) =829987a(12) =4197273a(13) =21456444a(14) =110716585a(15) =576027737a(16) =3018986040a(17) =15927330105a(18) =84530870455a(19) =451069339063