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 A355562 #8 Jul 07 2022 02:04:47 %S A355562 0,1,1,2,1,5,3,10,13,31,44,103,169,360,643,1317,2479,5036,9716,19592, %T A355562 38511,77465,153686,309093,617426,1243392,2496186,5035612 %N A355562 Number of blunt polypons with n cells. %C A355562 Polypons are defined in A057784. A blunt polypon is a polypon with no internal angle of 30 degrees. %C A355562 Comments by _Joseph Myers_ in A057784 regarding division of hexagons also apply to this sequence. %H A355562 Andrew Clarke, <a href="http://www.recmath.com/PolyPages/PolyPages/PolyX/PolyX.htm">Other Polyforms</a> [beware of errors for this particular form] %H A355562 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a355/A355562.java">Java program</a> (github) %H A355562 Sean A. Irvine, <a href="/A355562/a355562.png">The 5 blunt 6-pons</a> %H A355562 Sean A. Irvine, <a href="/A355562/a355562.pdf">The 44 blunt 11-pons</a> %Y A355562 Cf. A057784, A057785 (erroneous version). %K A355562 nonn,nice,hard,more %O A355562 1,4 %A A355562 _Sean A. Irvine_, Jul 06 2022