Squares that are the sum of the digits of the numbers from 0 to n, for some n.

Terms

a(0) =0a(1) =1a(2) =36a(3) =81a(4) =100a(5) =144a(6) =289a(7) =441a(8) =784a(9) =900a(10) =1225a(11) =1296a(12) =3025a(13) =3600a(14) =5041a(15) =5625a(16) =6400a(17) =8100a(18) =8649a(19) =10000a(20) =11881a(21) =15625a(22) =15876a(23) =18225a(24) =23716a(25) =36100a(26) =41616a(27) =44100a(28) =50625a(29) =55225