Wiener index of the n-sun graph.

Terms

a(0) =6a(1) =21a(2) =44a(3) =75a(4) =114a(5) =161a(6) =216a(7) =279a(8) =350a(9) =429a(10) =516a(11) =611a(12) =714a(13) =825a(14) =944a(15) =1071a(16) =1206a(17) =1349a(18) =1500a(19) =1659a(20) =1826a(21) =2001a(22) =2184a(23) =2375a(24) =2574a(25) =2781a(26) =2996a(27) =3219a(28) =3450a(29) =3689