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 A293931 #9 Jan 20 2018 10:09:43 %S A293931 2,10,14,42,82,214,478,1186,2786 %N A293931 Number of circularly chained n-tuples of 2 X 2 alternating sign matrices. %H A293931 Heuer, Dylan, Chelsey Morrow, Ben Noteboom, Sara Solhjem, Jessica Striker, and Corey Vorland. "Chained permutations and alternating sign matrices - Inspired by three-person chess." Discrete Mathematics 340, no. 12 (2017): 2732-2752. Also <a href="http://arxiv.org/abs/1611.03387">arXiv:1611.03387</a>. %Y A293931 Cf. A005130, A293178, A293179, A293180, A293930, A059475. %K A293931 nonn,more %O A293931 1,1 %A A293931 _N. J. A. Sloane_, Oct 19 2017