The Szeged index of a benzenoid consisting of a linear chain of n hexagons.

Terms

a(0) =54a(1) =243a(2) =656a(3) =1381a(4) =2506a(5) =4119a(6) =6308a(7) =9161a(8) =12766a(9) =17211a(10) =22584a(11) =28973a(12) =36466a(13) =45151a(14) =55116a(15) =66449a(16) =79238a(17) =93571a(18) =109536a(19) =127221a(20) =146714a(21) =168103a(22) =191476a(23) =216921a(24) =244526a(25) =274379a(26) =306568a(27) =341181a(28) =378306a(29) =418031