a(n) = 676*n^2 - 26.

Terms

a(0) =650a(1) =2678a(2) =6058a(3) =10790a(4) =16874a(5) =24310a(6) =33098a(7) =43238a(8) =54730a(9) =67574a(10) =81770a(11) =97318a(12) =114218a(13) =132470a(14) =152074a(15) =173030a(16) =195338a(17) =218998a(18) =244010a(19) =270374a(20) =298090a(21) =327158a(22) =357578a(23) =389350a(24) =422474a(25) =456950a(26) =492778a(27) =529958a(28) =568490a(29) =608374