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%I #22 Apr 03 2020 21:45:02
%S 1,1,1,2,3,5,12,34,218,4278,431165,162267174,201636689352,
%T 777816803938932,9865957936943859185,395886667549681686369527,
%U 53716176608076643470380213991,23524515269630339982914608683548933,35682168849414944013547274439525153167248
%N Number of simple connected regular bipartite graphs with 2n nodes.
%H Brendan 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 For n > 1, these are the row sums of triangle A008326.
%Y Cf. A005142, A008324.
%K nonn,hard,nice
%O 0,4
%A _Brendan McKay_
%E a(10) corrected and a(11) added by _Brendan McKay_, Sep 06 2018
%E a(0)=1 prepended and terms a(12) and beyond from _Andrew Howroyd_, Apr 03 2020
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