A217945 Number of indecomposable slim semimodular lattices of length n.

0, 0, 1, 2, 8, 39, 242, 1759, 14674, 137127, 1416430, 16006403, 196400810

Offset

0,4

Comments

For computer programs and tables of first 100 terms of A217944 and A217945 see the authors' web sites.

Links

Table of n, a(n) for n=0..12.

Gábor Czédli, László Ozsvárt, and Balázs Udvari, How many ways can two composition series intersect?, Discrete Math. 312 (2012), no. 24, 3523--3536. MR2979481.

Czedli, Gabor; Ozsvart, Laszlo; and Udvari, Balazs. How many ways can two composition series intersect? Discrete Math. 312 (2012), no. 24, 3523--3536. MR2979481

Crossrefs

Cf. A217944.

Sequence in context: A068107 A308207 A307709 * A091073 A266468 A326963

Adjacent sequences: A217942 A217943 A217944 * A217946 A217947 A217948

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 07 2012

Status

approved