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 A351684 #50 Apr 26 2023 07:08:15 %S A351684 1,4,3,7,7,13,9,15,9,14,12,27,19,29,26,29,20,36,26,48,42,46,44,53,32, %T A351684 54,49,69,62,82,58,72,60,67,73,119,85,106,99,93,85,126,100,152,132, %U A351684 142,125,145,107,142,147,185,161,194,146,169,160,186,192,271,195,251,209,199,207,260,230,330,272,275,255,293 %N A351684 Number of convex polydrafters with n cells. These are proper polydrafters, whose cells conform to the polyiamond grid. Mirror images are identified. %C A351684 These are conforming polydrafters as in A056842, as defined by Ed Pegg. They do not include extended polydrafters. See the Logelium link. %H A351684 Bernd Karl Rennhak, <a href="http://www.logelium.de/Drafter/PolyDrafter.htm">Polydrafter</a>, at Logelium. %H A351684 George Sicherman, <a href="https://sicherman.net/drvexcat/drvexcat.html">Catalogue of Convex Polydrafters</a> %e A351684 For n=2 there are 6 proper didrafters. Four are convex: the rectangle, the kite, the moniamond (equilateral triangle), and the monopons (30°-30°-120° triangle). Thus a(2) = 4. %Y A351684 Cf. A056842, A217720, A289137. %K A351684 nonn %O A351684 1,2 %A A351684 _George Sicherman_, May 16 2022