a(n) = 2025*n^2 - 3401*n + 1428.

Terms

a(0) =52a(1) =2726a(2) =9450a(3) =20224a(4) =35048a(5) =53922a(6) =76846a(7) =103820a(8) =134844a(9) =169918a(10) =209042a(11) =252216a(12) =299440a(13) =350714a(14) =406038a(15) =465412a(16) =528836a(17) =596310a(18) =667834a(19) =743408a(20) =823032a(21) =906706a(22) =994430a(23) =1086204a(24) =1182028a(25) =1281902a(26) =1385826a(27) =1493800a(28) =1605824a(29) =1721898