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 A293930 #10 Jan 20 2018 11:53:32 %S A293930 1,2,20,40,3430,6860 %N A293930 Number of circularly chained n X n alternating sign matrices. %H A293930 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 A293930 Cf. A005130, A293178, A293179, A293180. %K A293930 nonn,more %O A293930 1,2 %A A293930 _N. J. A. Sloane_, Oct 19 2017