The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A066305 Number of connected reduced partially ordered sets (posets) with n unlabeled elements. 1
1, 0, 2, 5, 22, 117 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..6.
N. J. A. Sloane, Transforms
Index entries for sequences related to posets
CROSSREFS
Cf. A000608. Inverse Euler transform of A066304.
Sequence in context: A115602 A115601 A015557 * A020093 A329260 A111542
Adjacent sequences: A066302 A066303 A066304 * A066306 A066307 A066308
KEYWORD
nonn,more
AUTHOR
Christian G. Bower, Dec 12 2001
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 May 25 04:52 EDT 2024. Contains 372782 sequences. (Running on oeis4.)