OFFSET
1,3
LINKS
V. Jovovic and G. Kilibarda, Enumeration of labeled quasi-initially connected digraphs, Discrete Math., 224 (2000), 151-163.
EXAMPLE
Triangle starts:
1;
0,2,1;
0,0,12,20,15,6,1;
0,0,0,104,426,768,920,792,495,220,66,12,1;
...
Number of digraphs with a quasi-source on 3 labeled nodes is 54=12+20+15+6+1.
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Vladeta Jovovic, Goran Kilibarda, Sep 14 2000
STATUS
approved