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 A197461 #14 Dec 16 2024 16:08:50 %S A197461 3,6,14,36,99,281,816,2415,7260,22074,67743,209552,652566,2043672, %T A197461 6431715,20328504,64494678,205303537,655493697,2098500135,6734498816, %U A197461 21660087087,69805491342 %N A197461 Number of fixed poly-[3.6.3.6]-tiles (holes allowed) with n cells (division into rhombi is significant). %D A197461 Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4. %Y A197461 Cf. A197459, A197460. %K A197461 hard,more,nonn %O A197461 1,1 %A A197461 _Joseph Myers_, Oct 15 2011 %E A197461 a(18)-a(22) from _Aaron N. Siegel_, May 16 2022 %E A197461 a(23) from _Johann Peters_, Dec 16 2024