COMPOSE squares with squares.

Terms

a(0) =1a(1) =8a(2) =50a(3) =276a(4) =1397a(5) =6672a(6) =30565a(7) =135668a(8) =587426a(9) =2493056a(10) =10407393a(11) =42848800a(12) =174348417a(13) =702245128a(14) =2803634370a(15) =11106624804a(16) =43697519013a(17) =170871040752a(18) =664492915061