Kekulé numbers for certain benzenoids.

Terms

a(0) =1a(1) =29a(2) =275a(3) =1498a(4) =5846a(5) =18250a(6) =48546a(7) =114480a(8) =245751a(9) =489247a(10) =915629a(11) =1627418a(12) =2768740a(13) =4536884a(14) =7195828a(15) =11091888a(16) =16671645a(17) =24502305a(18) =35294647a(19) =49928714a(20) =69482402a(21) =95263102a(22) =128842550a(23) =172095040a(24) =227239155a(25) =296883171a(26) =384074289