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A030269 Number of nonisomorphic disconnected partial lattices. 0

%I #6 Dec 19 2015 12:30:39

%S 0,0,1,2,6,18,69,287,1397,7634,46972,321014,2416305,19840547,

%T 176267022,1681915809,17127587977,185127766583

%N Number of nonisomorphic disconnected partial lattices.

%C 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.

%Y a(n) = A006966(n-2) - A030268(n).

%K nonn,hard

%O 0,4

%A _Christian G. Bower_, revised Dec 28 2000

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Last modified May 9 12:21 EDT 2024. Contains 372350 sequences. (Running on oeis4.)