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 A220869 #12 Nov 28 2016 00:36:11 %S A220869 1,1,171,1037,48605,550969,16231655,242436361,5811552169,99314257745, %T A220869 2155420214569,39424864309289,814300033798553,15418987976034589, %U A220869 310609546719927905,5986274269170524449,119070864662878688121,2315588762204123710545,45762166856599268084337 %N A220869 Number of ways to tile an 8 X n rectangle with 1 X 2 and 2 X 2 tiles (i.e., dominoes and squares). %H A220869 Alois P. Heinz, <a href="/A220869/b220869.txt">Table of n, a(n) for n = 0..300</a> %H A220869 S. Butler and S. Osborne, <a href="http://orion.math.iastate.edu/butler/papers/14_02_walks.pdf">Counting tilings by taking walks</a>, 2012. %Y A220869 Cf. A063652, A220870. %K A220869 nonn %O A220869 0,3 %A A220869 _N. J. A. Sloane_, Dec 27 2012 %E A220869 More terms from _Alois P. Heinz_, Jun 06 2013