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 A197467 #23 Dec 16 2024 22:18:49 %S A197467 4,6,12,25,56,132,320,792,1976,4962,12576,32140,82704,214044,556576, %T A197467 1453210,3808592,10015134,26413468,69844263,185126524,491758054, %U A197467 1308874676,3490068514,9321677540,24935748182,66798957432 %N A197467 Number of fixed poly-[4.8^2]-tiles (holes allowed) with n cells (division into triangles is significant). %D A197467 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4. %H A197467 Gill Barequet and Minati De, <a href="https://doi.org/10.1007/978-3-030-26176-4_2">A Lower Bound on the Growth Constant of Polyaboloes on the Tetrakis Lattice</a>, International Computing and Combinatorics Conference (COCOON 2019): Computing and Combinatorics, 13-24. %Y A197467 Cf. A197465, A197466. %K A197467 hard,nonn %O A197467 1,1 %A A197467 _Joseph Myers_, Oct 15 2011 %E A197467 a(21) from _Johann Peters_, Oct 31 2024 %E A197467 a(22)-a(27) from _Johann Peters_, Dec 16 2024