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