The Wiener index of the Dutch windmill graph D(5,n) (n>=1).

Terms

a(0) =15a(1) =78a(2) =189a(3) =348a(4) =555a(5) =810a(6) =1113a(7) =1464a(8) =1863a(9) =2310a(10) =2805a(11) =3348a(12) =3939a(13) =4578a(14) =5265a(15) =6000a(16) =6783a(17) =7614a(18) =8493a(19) =9420a(20) =10395a(21) =11418a(22) =12489a(23) =13608a(24) =14775a(25) =15990a(26) =17253a(27) =18564a(28) =19923a(29) =21330