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A072407 Canonically 2-indecomposable posets with n antichains. 1
0, 1, 0, 0, 0, 0, 0, 2, 1, 1, 0, 7, 5, 16, 14, 40, 41, 120, 131, 321, 402, 901, 1210, 2590, 3621, 7371, 10841, 21178, 32222, 61273, 95408, 177384, 282405, 515174, 833295, 1500030, 2455337, 4372535, 7229231, 12761691, 21260746, 37286778, 62483221, 109014426, 183542099, 318906720, 538889399, 933361886, 1581666042 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..49.

M. Erné, J. Heitzig and J. Reinhold, On the number of distributive lattices, Electronic Journal of Combinatorics, 9 (2002), #R24.

CROSSREFS

Cf. A006982, A072361.

Sequence in context: A156612 A342645 A096801 * A061158 A180843 A318141

Adjacent sequences:  A072404 A072405 A072406 * A072408 A072409 A072410

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 01 2002

STATUS

approved

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Last modified April 21 07:26 EDT 2021. Contains 343146 sequences. (Running on oeis4.)