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%I #12 Oct 26 2019 09:59:23
%S 1,4,16,68,324,1776,11204,80512,651076,5859204,58117016,630181168,
%T 7417888504,94216151156,1284469275324,18710413293092,290033953850736,
%U 4767191101639844,82819769006424276,1516403268298151208
%N Related to label-increasing forests with branching bounded by 4.
%C Sequence C_n(4) in Riordan 1978 or 1979.
%H John Riordan, <a href="/A297196/a297196.pdf">Forests of label-increasing trees</a>, annotated scanned copy of 1978 pre-publication version.
%H John Riordan, <a href="https://doi.org/10.1002/jgt.3190030204">Forests of label-increasing trees</a>, J. Graph Theory, 3 (1979), 127-133.
%F E.g.f.: F(x)^2, where F(x) is the e.g.f. for A297200. - _Max Alekseyev_, Jul 12 2019
%Y Cf. A297196, A297197, A297198, A297200, A297201, A297202, A297204.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Jan 10 2018
%E Edited and more terms added by _Max Alekseyev_, Jul 12 2019
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