login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217944 Number of different lattices formed by intersections of two composition series of length n. 2
1, 1, 2, 5, 17, 73, 397, 2623, 20414, 181607, 1809104, 19886032, 238723606 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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.

CROSSREFS

Cf. A217945.

Sequence in context: A102038 A002135 A260337 * A007868 A136726 A112831

Adjacent sequences: A217941 A217942 A217943 * A217945 A217946 A217947

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 07 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 2 13:44 EST 2022. Contains 358510 sequences. (Running on oeis4.)