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 A252787 #7 Dec 23 2014 15:37:01 %S A252787 0,0,1,3,7,28,131,26465,2832610615,18602165186505644, %T A252787 1577146952504975321253720851 %N A252787 Number of exponent-7 class 2 groups of order 7^n. %H A252787 J. H. Conway, Heiko Dietrich and E. A. O'Brien, <a href="http://www.math.auckland.ac.nz/~obrien/research/gnu.pdf">Counting groups: gnus, moas and other exotica</a>. %H A252787 Bettina Eick and E. A. O'Brien, <a href="http://www.math.auckland.ac.nz/~obrien/research/count-pgroups.pdf">Enumerating p-groups</a>. Group theory. J. Austral. Math. Soc. Ser. A 67 (1999), no. 2, 191-205. %H A252787 E. A. O'Brien, <a href="https://www.math.auckland.ac.nz/~obrien/research/bibliography.pdf">Bibliography on the determination of finite groups</a>. %Y A252787 Cf. A090140, A252784, A252785, A252786. %K A252787 nonn,hard,more %O A252787 0,4 %A A252787 _Eric M. Schmidt_, Dec 21 2014