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

Terms

a(0) =0a(1) =1a(2) =6a(3) =18a(4) =44a(5) =90a(6) =174a(7) =294a(8) =472a(9) =702a(10) =1010a(11) =1430a(12) =1932a(13) =2574a(14) =3346a(15) =4230a(16) =5264a(17) =6494a(18) =7938a(19) =9538a(20) =11380a(21) =13440a(22) =15686a(23) =18216a(24) =21000a(25) =24100a(26) =27586a(27) =31374a(28) =35420a(29) =39788