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%I #16 Sep 02 2019 06:15:26
%S 1,1,0,1,1,2,3,8,17,45,123,367,1148,3792
%N Spherical congruence-uniform lattices on n unlabeled nodes
%C A lattice is congruence-uniform if it can be constructed from the singleton-lattice by a sequence of interval doublings. A lattice is spherical if its Möbius function between least and greatest element equals 1 or -1.
%H A. Day, <a href="http://dx.doi.org/10.4153/CJM-1979-008-x">Characterizations of finite lattices that are bounded-homomorphic images or sublattices of free lattices</a>, Canadian Journal of Mathematics, 31 (1979), 617-631.
%H H. Mühle, <a href="https://arxiv.org/abs/1708.02104">On the lattice property of shard orders</a>, arXiv:1708.02104 [math.CO], 2017.
%Y Cf. A292790.
%K nonn,more
%O 1,6
%A _Henri Mühle_, Sep 25 2017
%E a(13)-a(14) from _Henri Mühle_, Aug 29 2019
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