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 A350627 #32 Mar 29 2022 18:33:30 %S A350627 1,10,22,30,36,44 %N A350627 Solution to Forest of Numbers (Bosque de Números) puzzle if we start with the numbers 1 through n (see Comments). %C A350627 Start with an infinite square grid. Each cell has eight neighbors. Place the numbers 1, 2, ..., n anywhere. Now place the numbers n+1, n+2, ..., m in order, subject to the rule that when you place k, the sum of its neighbors must equal k. Then a(n) is the maximum m that can be achieved. %C A350627 This is similar to the Stepping Stones problem discussed in A337663, but predates it by more than 20 years. %C A350627 As can be seen in the El Acertijo (The Riddle) links and in _Rodolfo Kurchan_'s webpage, there are at least six similar problems, for example when the numbers are restricted to an n X n square board. All of these are worthy of inclusion in the OEIS once enough terms are known. %H A350627 El Acertijo, <a href="https://el-acertijo.blogspot.com/2008/06/el-acertijo-05-pagina-08.html">Number 5, Page 8</a>, April 1993. %H A350627 El Acertijo, <a href="https://el-acertijo.blogspot.com/2008/06/el-acertijo-05-pagina-09.html">Number 5, Page 9</a>, April 1993. %H A350627 El Acertijo, <a href="https://el-acertijo.blogspot.com/2008/06/el-acertijo-05-pagina-18.html">Number 5, Page 18</a>, April 1993. %H A350627 El Acertijo, <a href="https://el-acertijo.blogspot.com/2008/07/el-acertijo-07-pagina-15.html">Number 7, Page 15</a>, August/September 1993. %H A350627 Rudolfo Kurchan, <a href="https://www.puzzlefun.online/problems">Puzzle Fun</a> %H A350627 Giorgio Vecchi, <a href="/A350627/a350627.jpg">Solution for a(5) = 36</a> %H A350627 Giorgio Vecchi, <a href="/A350627/a350627_1.jpg">Solution for a(6) = 44</a> %Y A350627 Cf. A337663 (Stepping Stones problem). %K A350627 nonn,more %O A350627 1,2 %A A350627 _N. J. A. Sloane_, Feb 05 2022 %E A350627 a(5)-a(6) from _Rodolfo Kurchan_, Mar 29 2022