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 A291216 #29 Apr 01 2022 11:38:49 %S A291216 0,1,4,9,16,49 %N A291216 Padovan numbers that are also squares. %C A291216 Common terms of A000931 and A000290. %C A291216 Cited from Ian Stewart's article "Tales of a Neglected Number": "Some Padovan numbers, such as 9, 16 and 49, are perfect squares - are there others?" %C A291216 No other terms < 10^(10^5). - _Chai Wah Wu_, Aug 31 2017 %H A291216 Ian Stewart, <a href="http://web.archive.org/web/20120330094207/http://www.fortunecity.com/emachines/e11/86/padovan.html">Tales of a Neglected Number</a>, Mathematical Recreations, Scientific American, June 1996. %H A291216 Ian Stewart, <a href="https://www.jstor.org/stable/24989576">Tales of a Neglected Number</a>, Mathematical Recreations, Scientific American, Vol. 274, No. 6 (1996), pp. 102-103. %H A291216 Ian Stewart, <a href="http://www.spektrum.de/magazin/die-unscheinbare-schwester-der-goldenen-zahl/824251">Die unscheinbare Schwester der goldenen Zahl</a>, Spektrum der Wissenschaft, Dossier 02/2003: Mathematische Unterhaltungen II, 55-57. %Y A291216 Cf. A000931, A000290, A100891, A122498, A291673. %K A291216 nonn,more,hard %O A291216 1,3 %A A291216 _Hugo Pfoertner_, Aug 31 2017