This site is supported by donations to The OEIS Foundation.



110 people attended OEIS-50 (videos, suggestions); annual fundraising drive to start soon (donate); editors, please edit! (stack is over 300), your editing is more valuable than any donation.

(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A101388 Number of n-vertex unlabeled digraphs without endpoints. 0


%S 1,1,8,137,7704,1413982

%N Number of n-vertex unlabeled digraphs without endpoints.

%Y Cf. A100548 (labeled case), A004110, A004108, A059166, A059167.

%K more,nonn

%O 1,3

%A Goran Kilibarda, Zoran Maksimovic, _Vladeta Jovovic_, Jan 14 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified October 25 23:29 EDT 2014. Contains 248566 sequences.