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%I #12 Apr 04 2020 17:41:48
%S 1,1,7,157,62616,78322916,147252447227,376962851057234,
%T 1280344203366849969,5666901233595672365908,
%U 32193489258177947645878365,231605871969834571512497704231,2084558172807256752718977250960988
%N Number of connected regular bipartite graphs of degree 6 with 2n nodes.
%D CRC Handbook of Combinatorial Designs, 1996, p. 648.
%D I. A. Faradzev, Constructive enumeration of combinatorial objects, pp. 131-135 of Problèmes combinatoires et théorie des graphes (Orsay, 9-13 Juillet 1976). Colloq. Internat. du C.N.R.S., No. 260, Centre Nat. Recherche Scient., Paris, 1978.
%H B. D. McKay and E. Rogoyski, <a href="http://www.combinatorics.org/Volume_2/volume2.html#N3">Latin squares of order ten</a>, Electron. J. Combinatorics, 2 (1995) #N3.
%Y Column k=6 of A008326.
%K nonn,hard
%O 6,3
%A _N. J. A. Sloane_
%E More terms from Eric Rogoyski, May 15 1997
%E a(12)-a(18) from _Andrew Howroyd_, Apr 04 2020
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