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%I M3312 #22 Feb 23 2021 10:07:27
%S 1,4,7,18,26,68,91,248,318,900,1122,3278,4004,12012,14443,44304,52598,
%T 164424,193154,613700,714476,2302344,2659582,8677072,9954860,32836180,
%U 37442160,124715430,141430680,475237500,536257995,1816267680,2040199590,6959878200
%N Number of unrooted triangulations with reflection symmetry of a disk with 2 internal nodes and n+3 nodes on the boundary.
%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="/A005509/b005509.txt">Table of n, a(n) for n = 0..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)
%H C. F. Earl & N. J. A. Sloane, <a href="/A005500/a005500.pdf">Correspondence, 1980-1981</a>
%Y Row n=2 of the array in A169809.
%K nonn
%O 0,2
%A _N. J. A. Sloane_
%E Terms a(6) and beyond from _Andrew Howroyd_, Feb 22 2021
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