A008323 Number of simple connected regular bipartite graphs with 2n nodes.

1, 1, 1, 2, 3, 5, 12, 34, 218, 4278, 431165, 162267174, 201636689352, 777816803938932, 9865957936943859185, 395886667549681686369527, 53716176608076643470380213991, 23524515269630339982914608683548933, 35682168849414944013547274439525153167248

Offset: 0

Author

Brendan McKay

Keywords

• nonn
• hard
• nice

Links

• Brendan McKay and E. Rogoyski, Latin squares of order ten, Electron. J. Combinatorics, 2 (1995) #N3.

Crossrefs

For n > 1, these are the row sums of triangle A008326.

Cf. A005142, A008324.

Extensions

a(10) corrected and a(11) added by Brendan McKay, Sep 06 2018

a(0)=1 prepended and terms a(12) and beyond from Andrew Howroyd, Apr 03 2020