Wiener index of the n-sunlet graph.

Terms

a(0) =27a(1) =60a(2) =105a(3) =174a(4) =259a(5) =376a(6) =513a(7) =690a(8) =891a(9) =1140a(10) =1417a(11) =1750a(12) =2115a(13) =2544a(14) =3009a(15) =3546a(16) =4123a(17) =4780a(18) =5481a(19) =6270a(20) =7107a(21) =8040a(22) =9025a(23) =10114a(24) =11259a(25) =12516a(26) =13833a(27) =15270a(28) =16771a(29) =18400