Squares of the form k^2+(k+23)^2 with integer k.

Terms

a(0) =289a(1) =529a(2) =1369a(3) =4225a(4) =13225a(5) =42025a(6) =139129a(7) =444889a(8) =1423249a(9) =4721929a(10) =15108769a(11) =48344209a(12) =160402225a(13) =513249025a(14) =1642275625a(15) =5448949489a(16) =17435353849a(17) =55789022809a(18) =185103876169a(19) =592288777609