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 A005027 M1294 #18 Feb 23 2021 18:14:00 %S A005027 1,2,4,16,63,328,1933,12633,87466,633015,4717745,35980100,279418926, %T A005027 2202903618,17590599410,142025760202,1157868883224,9520828261067, %U A005027 78888071847324,658158709983945,5525145717439001,46644670326913204,395812792437224022,3374572617006946447 %N A005027 Number of trivalent maps with n nodes. %D A005027 C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979. %D A005027 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005027 Andrew Howroyd, <a href="/A005027/b005027.txt">Table of n, a(n) for n = 3..500</a> %H A005027 C. F. Earl and L. J. March, <a href="/A005500/a005500_1.pdf">Architectural applications of graph theory</a>, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979. (Annotated scanned copy) %F A005027 a(n) = (A005028(n) + A341855(n))/2. - _Andrew Howroyd_, Feb 22 2021 %o A005027 (PARI) \\ See link in A169808 for script. %o A005027 A169808AntidiagonalSums(25) \\ _Andrew Howroyd_, Feb 22 2021 %Y A005027 Antidiagonal sums of array in A169808. %K A005027 nonn %O A005027 3,2 %A A005027 _N. J. A. Sloane_ %E A005027 a(10) corrected and terms a(11) and beyond from _Andrew Howroyd_, Feb 22 2021