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!)
A055532 Number of labeled order relations on n nodes in which longest chain has 3 nodes. 2
6, 108, 2310, 65700, 2583126, 142259628, 11012710470, 1196543891700, 181782466114326, 38435786111785788, 11256358984173551430 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 60.

LINKS

Table of n, a(n) for n=3..13.

CROSSREFS

A column or diagonal of triangle in A342587.

Sequence in context: A099138 A230540 A295791 * A288148 A010563 A114310

Adjacent sequences: A055529 A055530 A055531 * A055533 A055534 A055535

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 10 2000

EXTENSIONS

Extended to n=13 by Brendan McKay, Mar 16 2021

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 6 21:00 EST 2022. Contains 358648 sequences. (Running on oeis4.)