The hyper-Wiener index of the cyclic phenylene with n hexagons (n>=3).

Terms

a(0) =1062a(1) =2760a(2) =5715a(3) =10386a(4) =17304a(5) =27072a(6) =40365a(7) =57930a(8) =80586a(9) =109224a(10) =144807a(11) =188370a(12) =241020a(13) =303936a(14) =378369a(15) =465642a(16) =567150a(17) =684360a(18) =818811a(19) =972114a(20) =1145952a(21) =1342080a(22) =1562325a(23) =1808586a(24) =2082834a(25) =2387112a(26) =2723535a(27) =3094290