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 A197157 #8 Dec 05 2014 02:19:24 %S A197157 1,4,8,34,106,430,1616,6594,26588,110188,457964,1925498,8135692, %T A197157 34597729,147780810 %N A197157 Number of one-sided poly-[3^3.4^2]-tiles (polyhouses) (holes allowed) with n cells. %D A197157 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4. %H A197157 Brendan Owen, <a href="http://web.archive.org/web/20061229103147/http://members.optusnet.com.au/polyforms/2dforms/polyhouses/index.htm">Polyhouses</a> (gives a(1)-a(10)). %Y A197157 Cf. A197156, A197158. %K A197157 hard,nonn %O A197157 1,2 %A A197157 _Joseph Myers_, Oct 10 2011