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A005977
Reduced interval graphs with n nodes.
(Formerly M1787)
0
0, 0, 0, 0, 1, 2, 7, 31, 168, 1025, 7013, 52495, 425213, 3696032, 34291937, 338161526, 3532185118, 38963334652, 452704892533, 5526901638291, 70746674291507
OFFSET
1,6
REFERENCES
P. J. Hanlon, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Phil Hanlon, Counting interval graphs, Trans. Amer. Math. Soc. 272 (1982), no. 2, 383-426.
CROSSREFS
Sequence in context: A193657 A007164 A321208 * A199675 A352309 A059037
KEYWORD
nonn
AUTHOR
STATUS
approved