Number of benzenoids with 23 hexagons, C_(2v) symmetry and containing n carbon atoms.

Terms

a(0) =2a(1) =9a(2) =33a(3) =38a(4) =235a(5) =124a(6) =704a(7) =435a(8) =2283a(9) =1437a(10) =6954a(11) =3628a(12) =17864a(13) =9528a(14) =43798a(15) =24237a(16) =106293a(17) =53593a(18) =228216a(19) =104754a(20) =431864a(21) =188701a(22) =760883a(23) =300925a(24) =1212591a(25) =373411a(26) =1536669a(27) =305586a(28) =1298746a(29) =129710