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A030269 Number of nonisomorphic disconnected partial lattices. 0
0, 0, 1, 2, 6, 18, 69, 287, 1397, 7634, 46972, 321014, 2416305, 19840547, 176267022, 1681915809, 17127587977, 185127766583 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
A partial lattice is a poset where every pair of points has a unique least upper (greatest lower) bound or has no upper (lower) bound.
LINKS
CROSSREFS
a(n) = A006966(n-2) - A030268(n).
Sequence in context: A150081 A006674 A006389 * A150082 A177470 A060181
KEYWORD
nonn,hard
AUTHOR
Christian G. Bower, revised Dec 28 2000
STATUS
approved

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Last modified April 25 12:33 EDT 2024. Contains 371969 sequences. (Running on oeis4.)