Number of planar simply-connected polyhexes (or benzenoid hydrocarbons) with n hexagons.
A018190
Number of planar simply-connected polyhexes (or benzenoid hydrocarbons) with n hexagons.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =81a(6) =331a(7) =1435a(8) =6505a(9) =30086a(10) =141229a(11) =669584a(12) =3198256a(13) =15367577a(14) =74207910a(15) =359863778a(16) =1751594643a(17) =8553649747a(18) =41892642772a(19) =205714411986
External references
- oeis: A018190