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 A046744 #7 May 31 2019 20:13:04 %S A046744 1,0,0,2,24,552,21280,103760,70299264,5792853248,587159944704, %T A046744 71822743499520 %N A046744 Erroneous version of A000186. %H A046744 K. P. Bogart and J. Q. Longyear, <a href="https://doi.org/10.1090/S0002-9939-1976-0389618-9">Counting 3 by n Latin rectangles</a>, Proc. Amer. Math. Soc., 54 (1976), 463-467. %K A046744 dead %O A046744 0,4