a(n) = n*(10*n-3).

Terms

a(0) =0a(1) =7a(2) =34a(3) =81a(4) =148a(5) =235a(6) =342a(7) =469a(8) =616a(9) =783a(10) =970a(11) =1177a(12) =1404a(13) =1651a(14) =1918a(15) =2205a(16) =2512a(17) =2839a(18) =3186a(19) =3553a(20) =3940a(21) =4347a(22) =4774a(23) =5221a(24) =5688a(25) =6175a(26) =6682a(27) =7209a(28) =7756a(29) =8323