a(n) = 1250*n^2 - 1800*n + 649.

Terms

a(0) =649a(1) =99a(2) =2049a(3) =6499a(4) =13449a(5) =22899a(6) =34849a(7) =49299a(8) =66249a(9) =85699a(10) =107649a(11) =132099a(12) =159049a(13) =188499a(14) =220449a(15) =254899a(16) =291849a(17) =331299a(18) =373249a(19) =417699a(20) =464649a(21) =514099a(22) =566049a(23) =620499a(24) =677449a(25) =736899a(26) =798849a(27) =863299a(28) =930249