a(n) is the smallest square that is the sum of n distinct positive squares.

Terms

a(0) =1a(1) =25a(2) =49a(3) =81a(4) =100a(5) =169a(6) =196a(7) =289a(8) =361a(9) =529a(10) =529a(11) =900a(12) =900a(13) =1156a(14) =1444a(15) =1681a(16) =2025a(17) =2304a(18) =2704a(19) =3481a(20) =3600a(21) =4096a(22) =4624a(23) =4900a(24) =5625a(25) =6889a(26) =7225a(27) =8281a(28) =9409a(29) =10404