Kekulé numbers for certain benzenoids.

Terms

a(0) =1a(1) =45a(2) =632a(3) =4825a(4) =25227a(5) =101822a(6) =340416a(7) =986094a(8) =2551725a(9) =6028099a(10) =13209768a(11) =27179087a(12) =53000311a(13) =98685900a(14) =176508416a(15) =304743564a(16) =509943033a(17) =829849833a(18) =1317083800a(19) =2043740853a(20) =3107066435a(21) =4636381354a(22) =6801456960a(23) =9822556250