This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A068175 #10 Dec 28 2023 14:47:34 %S A068175 1,16,169,1369,13689,134689,13446889,1344468889,134444688889, %T A068175 13444446888889,1344444468888889,134444444688888889, %U A068175 13444444446888888889,1344444444468888888889,134444444444688888888889 %N A068175 a(1) = 1; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1). %e A068175 a(3) = 169; the smallest square obtained by inserting digits in it is 1369 hence a(4) = 1369. %Y A068175 A067633 gives square roots. %K A068175 base,nonn %O A068175 1,2 %A A068175 _Amarnath Murthy_, Feb 25 2002 %E A068175 Corrected and extended by _Ray Chandler_, Oct 11 2003