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 A336784 #24 Aug 17 2020 13:21:07 %S A336784 0,1,2,551,4,74,77,38,15,16,16,15,1185,41,17,84,273,21,25,20,1342,164, %T A336784 19,51,66,55,62,65,78,93,34,79,141,105,56,133,357,2621,100,119,799, %U A336784 278,149,305,305,126,99,227,387,272,274,465,714,580,689,172,282,2163 %N A336784 Number of steps in Conway's Game of Life for a block and row of n cells to stabilize. %H A336784 Wikipedia, <a href="https://en.wikipedia.org/wiki/Conway's_Game_of_Life">Conway's Game of Life</a>. %H A336784 Wikipedia, <a href="https://en.wikipedia.org/wiki/Methuselah_(cellular_automaton)">Methuselah (cellular automaton)</a>. %e A336784 As a block by itself is stable, a(0)=0. %e A336784 . . . . %e A336784 . o o . %e A336784 . o o . %e A336784 . . . . %e A336784 A block with a single square adjacent will turn into a boat on the next tick, which is stable. %e A336784 . . . . .|. . . . . %e A336784 . o o . .|. o o . . %e A336784 . o o . .|. o . o . %e A336784 . . . o .|. . o . . %e A336784 . . . . .|. . . . . %e A336784 A block with a row of two squares will take two generations to turn into a boat. %e A336784 . . . . . .|. . . . .|. . . . . %e A336784 . o o . . .|. o o . .|. o o . . %e A336784 . o o . . .|. o . . .|. o . o . %e A336784 . . . o o .|. . o o .|. . o . . %e A336784 . . . . . .|. . . . .|. . . . . %e A336784 A block with a row of three squares is known as a methuselah (see Wikipedia link), taking 551 generations to stabilize. The final configuration has two escaped gliders, one blinker, eight blocks, two boats, one ship, two beehives, one loaf, and one fleet. Only the initial configuration is shown below. %e A336784 . . . . . . . %e A336784 . o o . . . . %e A336784 . o o . . . . %e A336784 . . . o o o . %e A336784 . . . . . . . %K A336784 nonn %O A336784 0,3 %A A336784 _William C. Laursen_, Aug 04 2020