%I #10 Apr 09 2022 20:22:50
%S 1,18,164,1050,5367,23232,88125,299992,932849,2685747,7235237,
%T 18392853,44427807,102552852,227298680,485679518,1003915611,
%U 2013360324,3927664296,7469755903,13876848040,25225619858,44939663514,78569415198,134974052794,228088973049
%N Column 9 of triangle A055907.
%H A. J. Guttmann and A. R. Conway, <a href="https://researchers.ms.unimelb.edu.au/~guttmann@unimelb/articles/hexfinal.pdf">Hexagonal lattice directed site animals</a>, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999 (H_9 for hexagonal lattices Table 1).
%F G.f.: x^9*B(x)/((1-x)^19*(1+x)^9*(1+x^2)^8*(1+x^2+x^4)^6*(1+x^4)^4*(1+x^2+x^4+x^6+x^8)^2) where B(x) is g.f. of A055918.
%K nonn
%O 9,2
%A _Christian G. Bower_, Jun 22 2000
%E a(31) corrected and more terms from _Sean A. Irvine_, Apr 09 2022