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 A219928 #9 Sep 05 2021 19:19:30 %S A219928 1,1,55,595,9028,127707,1830234,26160354,374285478,5353011036, %T A219928 76569060586,1095191883209,15665062073662,224064344818735, %U A219928 3204894379079451,45841053844805851,655685372871482854,9378564896063570084,134145862914757375163,1918749051397966520006 %N A219928 Number of tilings of a 9 X n rectangle using integer-sided square tiles. %H A219928 Alois P. Heinz, <a href="/A219928/b219928.txt">Table of n, a(n) for n = 0..300</a> %Y A219928 Column k=9 of A219924. %Y A219928 Cf. A226552. %K A219928 nonn %O A219928 0,3 %A A219928 _Alois P. Heinz_, Dec 01 2012