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 A220870 #14 Nov 28 2016 00:35:51 %S A220870 1,34,12190,2326760,527889422,114411435032,25111681648122, %T A220870 5492577770367562,1202536689448371122,263209502307938563332, %U A220870 57615414908836236372072,12611480741795288044400788,2760554277959548230135794572,604262547591999576093481473784 %N A220870 Number of ways to tile an 8 X n rectangle with 1 X 1, 1 X 2 and 2 X 2 tiles (i.e., monomers, dominoes and squares). %H A220870 Alois P. Heinz, <a href="/A220870/b220870.txt">Table of n, a(n) for n = 0..200</a> %H A220870 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 A220870 Cf. A063652, A220869. %K A220870 nonn %O A220870 0,2 %A A220870 _N. J. A. Sloane_, Dec 27 2012 %E A220870 More terms from _Alois P. Heinz_, Jun 06 2013