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 A097996 #14 Feb 18 2015 07:54:19 %S A097996 5,5,7,11,17,17,30,32,26,26,43,41,37,40,71,56,54,54,69,81,84,104,109, %T A097996 96,114,123,142,128,134,141,172,182,216,224,239,255,283,265,351,304, %U A097996 358,370,411,411,407,434,470,488,514,556,567,568,597,657,659,704,739,793 %N A097996 Cell populations in the development of the L-pentomino with the 2D cellular automaton rule "Seeds" (/2). %H A097996 Eric M. Schmidt, <a href="/A097996/b097996.txt">Table of n, a(n) for n = 0..1000</a> %H A097996 Eric M. Schmidt, <a href="/A097996/a097996.cpp.txt">C++ code to compute this sequence</a> %H A097996 Mirek Wojtowicz, <a href="http://www.mirekw.com/ca/">Information on many 2D cellular automata</a> %H A097996 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %e A097996 a(1)= 5 because the L-pentomino contains 5 cells. a(2)= 5 because 5 cells are neighbors (in a Moore neighborhood) of exactly 2 of the original 5 cells. a(3)= 7 because 7 cells are neighbors of exactly 2 of the previous 5 cells. %Y A097996 Cf. A097981, A097995. %K A097996 nonn %O A097996 0,1 %A A097996 _Oliver Pechenik_, Sep 08 2004 %E A097996 Offset changed by _Eric M. Schmidt_, Mar 10 2013