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 A118450 #5 Jan 16 2022 22:10:00 %S A118450 1,4,41,488,8229,164892,4016613,112818960 %N A118450 Number of rooted n-edge one-vertex one-face maps on a non-orientable surface (of genus n). %C A118450 One-vertex one-face maps on orientable surfaces are counted by A035319. %D A118450 E. R. Canfield, Calculating the number of rooted maps on a surface, Congr. Numerantium, 76 (1990), 21-34. %D A118450 D. M. Jackson and T. I. Visentin, An atlas of the smaller maps in orientable and nonorientable surfaces. CRC Press, Boca Raton, 2001. %Y A118450 Main diagonal of A267180. %Y A118450 Cf. A035319. %K A118450 more,nonn %O A118450 1,2 %A A118450 _Valery A. Liskovets_, May 04 2006 %E A118450 a(7)-a(8) added by _Andrew Howroyd_, Jan 16 2022