a(n) = (11*n + 7)^2.

Terms

a(0) =49a(1) =324a(2) =841a(3) =1600a(4) =2601a(5) =3844a(6) =5329a(7) =7056a(8) =9025a(9) =11236a(10) =13689a(11) =16384a(12) =19321a(13) =22500a(14) =25921a(15) =29584a(16) =33489a(17) =37636a(18) =42025a(19) =46656a(20) =51529a(21) =56644a(22) =62001a(23) =67600a(24) =73441a(25) =79524a(26) =85849a(27) =92416a(28) =99225a(29) =106276