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 A006444 M0804 #16 Jan 14 2025 19:13:11 %S A006444 0,1,2,3,6,14,30,77,196,525,1414,3960,11056,31636,90818,264657,774146, %T A006444 2289787,6798562,20354005,61164374,184985060,561433922,1712696708, %U A006444 5241637812 %N A006444 Number of achiral 2-connected planar maps with n edges. %D A006444 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %D A006444 T. R. S. Walsh, personal communication. %H A006444 Timothy R. Walsh, <a href="/A007401/a007401.pdf">Number of sensed planar maps with n edges and m vertices</a>, p. 44. %Y A006444 Cf. A006402 (sensed), A006403 (unsensed), A006443 (connected), A006445 (3-connected). %K A006444 nonn %O A006444 1,3 %A A006444 _N. J. A. Sloane_