Smallest square with digit sum n (or 0 if no such square exists).

Terms

a(0) =1a(1) =0a(2) =0a(3) =4a(4) =0a(5) =0a(6) =16a(7) =0a(8) =9a(9) =64a(10) =0a(11) =0a(12) =49a(13) =0a(14) =0a(15) =169a(16) =0a(17) =576a(18) =289a(19) =0a(20) =0a(21) =1849a(22) =0a(23) =0a(24) =4489a(25) =0a(26) =3969a(27) =17956a(28) =0a(29) =0