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 A174253 #7 Jun 01 2022 11:31:25 %S A174253 1,1,9,1095,145415,15661597,1418159011,112976454947,8812020831683, %T A174253 706152947468301,58015563977931125 %N A174253 Number of tilings of a 9 X n rectangle with n nonominoes of any shape. %H A174253 R. S. Harris, <a href="http://www.bumblebeagle.org/polyominoes/tilingcounting/counting_9x9_tilings.pdf">Counting Nonomino Tilings and Other Things of that Ilk</a>, G4G9 Gift Exchange book, 2010. %H A174253 R. S. Harris, <a href="http://www.bumblebeagle.org/polyominoes/tilingcounting">Counting Polyomino Tilings</a> %Y A174253 Cf. A134438, A174248, A174249, A174250, A174251, A174252. %K A174253 nonn,more %O A174253 0,3 %A A174253 Bob Harris (me13013(AT)gmail.com), Mar 13 2010