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Related to label-increasing forests with branching bounded by 4.
7

%I #16 Oct 26 2019 09:59:12

%S 1,2,4,10,34,148,786,4920,35446,288822,2625844,26349340,289248224,

%T 3447860798,44348374106,612228009210,9028698146956,141655958846642,

%U 2355980548168314,41403643674710280,766627753698325214

%N Related to label-increasing forests with branching bounded by 4.

%C Sequence C_n(2) 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, A297202, A297203, 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