a(n) = n * [1 + sum(k=1 to n) prime(k)].

Terms

a(0) =0a(1) =3a(2) =12a(3) =33a(4) =72a(5) =145a(6) =252a(7) =413a(8) =624a(9) =909a(10) =1300a(11) =1771a(12) =2376a(13) =3107a(14) =3948a(15) =4935a(16) =6112a(17) =7497a(18) =9036a(19) =10811a(20) =12800a(21) =14973a(22) =17424a(23) =20125a(24) =23136a(25) =26525a(26) =30212a(27) =34155a(28) =38416a(29) =42949