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 A344301 #26 Jun 19 2021 03:54:24 %S A344301 1,2,3,4,8,12,15,16,24,28,35,36,48,54,63,64,77,88,96,100,117,130,140, %T A344301 144 %N A344301 Minimum number of cells in an n X n grid that need to be painted so that each unpainted cell is orthogonally adjacent to exactly one painted cell. %H A344301 Bert Dobbelaere, <a href="/A344301/a344301.png">Illustration for N=20</a> %H A344301 Dmitry Kamenetsky, <a href="/A344301/a344301.txt">Example solutions for n <= 10</a> %H A344301 Puzzling StackExchange, <a href="https://puzzling.stackexchange.com/questions/110235/paint-eight-squares">Paint Eight Squares</a>, 2021. %K A344301 nonn,hard,more %O A344301 1,2 %A A344301 _Dmitry Kamenetsky_, May 14 2021 %E A344301 a(11)-a(20) from _Bert Dobbelaere_, Jun 13 2021 %E A344301 a(21)-a(24) from _Bert Dobbelaere_, Jun 19 2021