a(n) = 72*n^2 + 1.

Terms

a(0) =1a(1) =73a(2) =289a(3) =649a(4) =1153a(5) =1801a(6) =2593a(7) =3529a(8) =4609a(9) =5833a(10) =7201a(11) =8713a(12) =10369a(13) =12169a(14) =14113a(15) =16201a(16) =18433a(17) =20809a(18) =23329a(19) =25993a(20) =28801a(21) =31753a(22) =34849a(23) =38089a(24) =41473a(25) =45001a(26) =48673a(27) =52489a(28) =56449a(29) =60553