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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
OFFSET
1,8
LINKS
M. Erné, J. Heitzig and J. Reinhold, On the number of distributive lattices, Electronic Journal of Combinatorics, 9 (2002), #R24.
CROSSREFS
Sequence in context: A342645 A350024 A096801 * A361999 A061158 A180843
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 01 2002
STATUS
approved