OFFSET
1,7
COMMENTS
The range for the subindex k is from n-1 to n(n+1)/2.
REFERENCES
E. Palmer and F. Harary, Graphical Enumeration, Academic Press, 1973.
LINKS
Marko R. Riedel, Number of distinct connected digraphs
Marko Riedel, Maple code for A070166 and A283755.
FORMULA
T(n,k) = A322114(k,n). - Andrew Howroyd, Oct 23 2019
EXAMPLE
First rows are:
1, 1;
1, 1, 1;
1, 3, 3, 2, 1;
2, 6, 11, 13, 10, 5, 2, 1;
3, 14, 35, 61, 75, 68, 49, 28, 13, 5, 2, 1;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Marko Riedel, Mar 15 2017
STATUS
approved