The Wiener index of the Dutch windmill graph D(6,n) (n>=1).

Terms

a(0) =27a(1) =144a(2) =351a(3) =648a(4) =1035a(5) =1512a(6) =2079a(7) =2736a(8) =3483a(9) =4320a(10) =5247a(11) =6264a(12) =7371a(13) =8568a(14) =9855a(15) =11232a(16) =12699a(17) =14256a(18) =15903a(19) =17640a(20) =19467a(21) =21384a(22) =23391a(23) =25488a(24) =27675a(25) =29952a(26) =32319a(27) =34776a(28) =37323a(29) =39960