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 A377978 #36 Nov 29 2024 21:38:54 %S A377978 2,2,6,11,6,2,6,11,6,2,6,11,6,2 %N A377978 Total number of coronal tilings for a width one length n straight polyiamond with the T2 triangle. %C A377978 Heesch numbers look at the buildout of coronal layers from a single type of tile. In contrast this sequence looks at a single type of tile being asked to form a corona around an expanding central frame. %C A377978 This central frame tiled with the hexiamond boat tile has a coronal expansion number of 12 (see links below). %C A377978 A376899 shows coronal tilings for the expansion of a central triangle frame and gives the definition for the coronal expansion number. %C A377978 Combining individual polyiamonds in various ways creates a variety of expansion frames._Craig Knecht_, Nov 29 2024 %H A377978 Craig Knecht, <a href="/A377978/a377978.png">example for the sequence</a>. %H A377978 Craig Knecht, <a href="/A377978/a377978_3.png">Expansion frame worksheet.</a> %H A377978 Craig Knecht, <a href="/A377978/a377978_1.png">Hexiamond boat corona</a>. %Y A377978 Cf. A376899. %K A377978 nonn,more %O A377978 1,1 %A A377978 _Craig Knecht_, Nov 26 2024