A008324 - OEIS

%I #21 Apr 04 2020 11:04:11

%S 1,2,3,4,6,8,18,40,230,4296,431206,162267272,201636689771,

%T 777816803942186,9865957936943931964,395886667549681689591841,

%U 53716176608076643470621234239,23524515269630339982914646821899537,35682168849414944013547274452501768506834

%N Number of simple regular bipartite graphs with 2n nodes.

%C First differs from A333732 at n = 12. - _Andrew Howroyd_, Apr 03 2020

%H Brendan McKay and E. Rogoyski, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v2i1n3">Latin squares of order ten</a>, Electron. J. Combinatorics, 2 (1995) #N3.

%Y Row sums of A008327.

%Y Cf. A033995, A008323, A333732.

%K nonn,hard,nice

%O 0,2

%A _Brendan McKay_

%E a(0)=1 prepended and terms a(11) and beyond from _Andrew Howroyd_, Apr 03 2020