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

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

Offset: 0

Author

Jori Mäntysalo, Mar 30 2016

Keywords

• nonn
• hard
• more

Crossrefs

Cf. A006966.

Programs

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)