A129420 Number of isomorphism classes of 5-regular loopless multigraphs of order 2n.

1, 5, 54, 1753, 189341, 46935710, 20494522535, 14041749098602, 14155266802426836, 20061744131278672638, 38587417589460488631726, 97900485588988429336271590, 320012505326477694925887757141, 1321269556386383657509085883067690, 6775074159053505093089897813890701467

Offset: 1

Author

Brendan McKay, Apr 15 2007

Keywords

• nonn

Comments

Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/

Crossrefs

Column k=5 of A333330.

Cf. A129419, A129431, A129416, A129418, A129422, A129424, A129426.

Formula

Euler transform of A129419. - Andrew Howroyd, Mar 17 2020

Extensions

a(8)-a(15) from Andrew Howroyd, Mar 21 2020