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 A006344 #11 Sep 16 2017 17:10:34 %S A006344 4,84,1340,19280,263284,3486224,45247084,579150012,7338291224, %T A006344 92272957568,1153361204996,14348020042512,177803262186064, %U A006344 2196338193610064,27057921450352204,332583930387073712 %N A006344 Number of rooted maps with n edges on Klein bottle. %D A006344 David M. Jackson and Terry I. Visentin, An Atlas of the Smaller Maps in Orientable and Nonorientable Surfaces, Chapman & Hall/CRC, circa 2000. See page 227. %H A006344 Didier Arquès and Jean-François Béraud, <a href="http://www.numdam.org/item/ITA_1997__31_4_385_0">Énumération des cartes pointées sur la bouteille de Klein</a>, RAIRO, vol. 31, no. 4, 1997, pp. 385-409. %Y A006344 A column of A267180. %K A006344 nonn %O A006344 2,1 %A A006344 Jean-Francois Beraud (beraud(AT)univ-mlv.fr)