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

Terms

a(0) =26a(1) =702a(2) =2730a(3) =6110a(4) =10842a(5) =16926a(6) =24362a(7) =33150a(8) =43290a(9) =54782a(10) =67626a(11) =81822a(12) =97370a(13) =114270a(14) =132522a(15) =152126a(16) =173082a(17) =195390a(18) =219050a(19) =244062a(20) =270426a(21) =298142a(22) =327210a(23) =357630a(24) =389402a(25) =422526a(26) =457002a(27) =492830a(28) =530010a(29) =568542