%I M5014 #19 Oct 30 2017 03:32:51
%S 0,0,0,16,177,1374,9370,60582,383577,2412331,15179013,95860821,
%T 608523299,3884620950,24937791531,160952346541,1044035753142,
%U 6803694176919,44526622599370,292538816181867,1928821043343096,12758939344710713
%N E-trees with exactly 3 colors.
%D G. Gati, F. Harary and R. W. Robinson, Line colored trees with extendable automorphisms, Acta Math. Scientia, 2 (1982), 105-110.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H G. Gati, F. Harary, R. W. Robinson, <a href="/A003238/a003238.pdf">Line colored trees with extendable automorphisms</a>, Acta Mathematica Scientia 2.1 (1982), 105-110. (Annotated scanned copy)
%H <a href="/index/Tra#trees">Index entries for sequences related to trees</a>
%F a(n) = A007142(n) - 3 * A007141(n) + 3 * A003238(n) for n > 1. - _Sean A. Irvine_, Oct 30 2017
%K nonn
%O 1,4
%A _N. J. A. Sloane_.
%E a(6) corrected and more terms from _Sean A. Irvine_, Oct 30 2017