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%I #12 Dec 21 2013 18:40:17
%S 6,30,318,6762,288354,24601830,4198550862,1433090327658,
%T 978320552816706,1335732803916035910,3647440466597769337518,
%U 19919887407714391756372362,217578288033980580931821414114,4753070216383849406954016223981350,207664806338411731603980735696210780942
%N Number of proper 3-colorings of the bi-iterative graph family G^4_n.
%H Alois P. Heinz, <a href="/A232978/b232978.txt">Table of n, a(n) for n = 0..75</a>
%H T. Kotek, J. A. Makowsky, <a href="http://arxiv.org/abs/1309.4020">Recurrence Relations for Graph Polynomials on Bi-iterative Families of Graphs</a>, arXiv preprint arXiv:1309.4020, 2013
%Y Cf. A232979.
%K nonn
%O 0,1
%A _N. J. A. Sloane_, Dec 07 2013
%E a(7)-a(14) from _Alois P. Heinz_, Dec 21 2013
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