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A229202
Number of semimodular lattices on n nodes.
2
1, 1, 1, 1, 2, 4, 8, 17, 38, 88, 212, 530, 1376, 3693, 10232, 29231, 85906, 259291, 802308, 2540635, 8220218, 27134483, 91258141, 312324027, 1086545705, 3838581926
OFFSET
0,5
LINKS
J. Kohonen, Generating modular lattices up to 30 elements, arXiv:1708.03750 [math.CO] preprint (2017).
CROSSREFS
Cf. A006966 (number of lattices), A006981 (number of modular lattices).
Sequence in context: A025276 A006461 A257300 * A003007 A086615 A357903
KEYWORD
nonn,more
AUTHOR
Nathan Lawless, Sep 15 2013
EXTENSIONS
a(23)-a(25) from Kohonen (2017), by Jukka Kohonen, Aug 15 2017
STATUS
approved