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A030268 Number of nonisomorphic connected partial lattices. 1
1, 1, 1, 3, 9, 35, 153, 791, 4597, 29988, 215804, 1697291, 14457059, 132392971, 1295346365, 13468653637, 148142236784, 1716782858995, 20889118889021 (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
N. J. A. Sloane, Transforms
FORMULA
Inverse Euler transform of A006966(n-2) (lattices).
MATHEMATICA
A006966 = Cases[Import["https://oeis.org/A006966/b006966.txt", "Table"], {_, _}][[All, 2]];
(* EulerInvTransform is defined in A022562 *)
Join[{1}, EulerInvTransform[Drop[A006966, 3]]] (* Jean-François Alcover, May 10 2019, updated Mar 17 2020 *)
CROSSREFS
Sequence in context: A327885 A074507 A217924 * A097277 A034428 A338793
KEYWORD
nonn,hard
AUTHOR
Christian G. Bower, revised Dec 28 2000
EXTENSIONS
a(17) (from A006966) from Jean-François Alcover, May 10 2019
a(18) (using A006966) from Alois P. Heinz, May 10 2019
STATUS
approved

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Last modified February 24 02:20 EST 2024. Contains 370288 sequences. (Running on oeis4.)