a(n) = 169*n^2 + 2*n.

Terms

a(0) =171a(1) =680a(2) =1527a(3) =2712a(4) =4235a(5) =6096a(6) =8295a(7) =10832a(8) =13707a(9) =16920a(10) =20471a(11) =24360a(12) =28587a(13) =33152a(14) =38055a(15) =43296a(16) =48875a(17) =54792a(18) =61047a(19) =67640a(20) =74571a(21) =81840a(22) =89447a(23) =97392a(24) =105675a(25) =114296a(26) =123255a(27) =132552a(28) =142187a(29) =152160