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
Links
- Brendan McKay and Adolfo Piperno, Nauty and Traces
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
Comments