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Search: id:A026865
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A026865 Number of labeled chain graphs. +0
1
1, 4, 50, 1688, 142624, 28903216, 13663125680, 14762428500992, 35888247726445696, 193881737041021767424, 2304330431696396880081920, 59754569042355286885937374208, 3357295191788547946256710562827264 (list; graph; listen)
OFFSET

1,2
REFERENCES

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

CROSSREFS

Adjacent sequences: A026862 A026863 A026864 this_sequence A026866 A026867 A026868

Sequence in context: A114480 A123356 A139087 this_sequence A016078 A122464 A048995

KEYWORD

nonn

AUTHOR

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

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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