A319897 Number of connected regular loopless multigraphs on n unlabeled nodes with degree up to n.

1, 1, 2, 1, 6, 7, 195, 984, 648947, 35494648, 689162614688, 250087643676776, 116889497942206867366

Offset: 0

Author

Natan Arie Consigli, Nov 28 2018

Keywords

• nonn
• more

Comments

Initial terms computed using 'Nauty and Traces'.

Links

• Brendan McKay and Adolfo Piperno, Nauty and Traces

Crossrefs

Cf. A289986, A325476, A328682.

Formula

a(n) = Sum_{k=0..n} A328682(n, k). - Andrew Howroyd, Mar 18 2020

Extensions

a(1), a(8) corrected and a(10)-a(12) added by Andrew Howroyd, Mar 18 2020