A271078 Number of non-isomorphic atomic lattices on n nodes.

0, 1, 1, 0, 1, 1, 2, 4, 9, 22, 59, 181

Offset

0,7

Links

Table of n, a(n) for n=0..11.

Prog

(SageMath)
for i in range(0, 12):
    n = 0
    for P in Posets(i):
        if P.is_lattice():
            L = LatticePoset(P)
            if L.is_atomic():
                n += 1
    print(n)

Crossrefs

Cf. A006966.

Sequence in context: A193361 A294281 A293854 * A292790 A278691 A159329

Adjacent sequences: A271075 A271076 A271077 * A271079 A271080 A271081

Keyword

nonn,hard,more

Author

Jori Mäntysalo, Mar 30 2016

Status

approved