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A026586 Number of labeled essential directed acyclic graphs (DAGs). 0
1, 1, 4, 59, 2616, 306117, 87716644, 58874478231, 90018247082416, 307775459402071913, 2322338398654088751036, 38293189001166839643861795, 1369158635491114830895696234696, 105480725505896171175318367295035341 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

REFERENCES

Bertran Steinsky, Enumeration of labeled chain graphs and labeled essential directed acyclic graphs, Discrete Mathematics, 270 (2003), 267-278.

CROSSREFS

Sequence in context: A198508 A126754 A194534 * A058173 A074835 A060492

Adjacent sequences:  A026583 A026584 A026585 * A026587 A026588 A026589

KEYWORD

nonn

AUTHOR

Detlef Pauly (dettodet(AT)yahoo.de), Aug 22 2003.

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.