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 A086973 #19 Sep 07 2022 10:03:49 %S A086973 0,0,0,0,0,0,2,2,2,4,2,2,6,6,8,8,14,14,2,2,28,28,6,6,62,62,16,16,126, %T A086973 126,28,28,112,60,6,6,10,30,2,56,2640,2,4,6,2,4,4,4,2,6,2,2,2,2,6,14, %U A086973 6,6,2,6,102,6,2,4,18,42,2,2,102,12,42,2,18,12,6 %N A086973 Period of oscillator reached starting with a segment of n consecutive live cells and applying the LongLife 2D rule (see comment). %C A086973 LongLife rule : birth occurs if dead cell has 3,4 or 5 neighbors. Survival occurs if live cell has 5 neighbors. (Sequence computed using LifeLab for mac). %H A086973 Rémy Sigrist, <a href="/A086973/a086973.gp.txt">PARI program</a> %H A086973 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GameofLife.html">Game of Life</a>. %o A086973 (PARI) See Links section. %Y A086973 Cf. A086993 (pre-periodic steps). %K A086973 nonn %O A086973 1,7 %A A086973 _Benoit Cloitre_, Sep 22 2003 %E A086973 More terms from _Rémy Sigrist_, Sep 07 2022