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 A065791 #6 Sep 17 2023 21:35:23 %S A065791 81,1681,1461681,220861461681,31071113326220861461681, %T A065791 36510705834446371569631071113326220861461681, %U A065791 268496773864458678522722709023395604054900436510705834446371569631071113326220861461681 %N A065791 a(1) = 81; for n > 1, a(n) is the smallest square > a(n-1) with a(n-1) forming its final digits. %C A065791 a(n) = A050634(n+1) for n >= 1. %Y A065791 Cf. A050634, A065689, A065792, A064793. %K A065791 base,nonn %O A065791 1,1 %A A065791 _Klaus Brockhaus_, Nov 19 2001