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 A214334 #10 Jan 08 2024 09:39:58 %S A214334 0,0,0,0,488,23320,696912,16662492,348539072,6664492800,119448394500, %T A214334 2038649084648,33485525450304,533300750150792,8280704684511728, %U A214334 125874875824299840,1879220531953481856,27623679628336696672,400620376541743419888,5741857194453928418268,81439444090140433607840,1144400134614241780601088,15947842815693549007349256,220579463084992470012209008,3030225572264584257706050816,41371174793045515157274738000 %N A214334 Number of rooted maps with n edges on the non-orientable surface of type 2. %H A214334 Didier Arquès and Alain Giorgetti, <a href="https://doi.org/10.1016/S0304-3975(98)00230-8">Counting rooted maps on a surface</a>, Theoret. Comput. Sci. 234 (2000), no. 1-2, 255--272. MR1745078 (2001f:05078). %Y A214334 Cf. A118451 (analog for surface of type 3/2). %K A214334 nonn %O A214334 0,5 %A A214334 _N. J. A. Sloane_, Jul 27 2012