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

Terms

a(0) =678a(1) =2708a(2) =6090a(3) =10824a(4) =16910a(5) =24348a(6) =33138a(7) =43280a(8) =54774a(9) =67620a(10) =81818a(11) =97368a(12) =114270a(13) =132524a(14) =152130a(15) =173088a(16) =195398a(17) =219060a(18) =244074a(19) =270440a(20) =298158a(21) =327228a(22) =357650a(23) =389424a(24) =422550a(25) =457028a(26) =492858a(27) =530040a(28) =568574a(29) =608460