a(n) = 2809*n^2 - 1000*n + 89.

Terms

a(0) =1898a(1) =9325a(2) =22370a(3) =41033a(4) =65314a(5) =95213a(6) =130730a(7) =171865a(8) =218618a(9) =270989a(10) =328978a(11) =392585a(12) =461810a(13) =536653a(14) =617114a(15) =703193a(16) =794890a(17) =892205a(18) =995138a(19) =1103689a(20) =1217858a(21) =1337645a(22) =1463050a(23) =1594073a(24) =1730714a(25) =1872973a(26) =2020850a(27) =2174345