login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A001375 Relational systems on n nodes.
(Formerly M4589 N1958)
0
8, 2080, 22386176, 11728394650624, 314824619911446167552 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

W. Oberschelp, ``Strukturzahlen in endlichen Relationssystemen,'' in Contributions to Mathematical Logic (Proceedings 1966 Hanover Colloquium), pp. 199-213, North-Holland Publ., Amsterdam, 1968.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..5.

CROSSREFS

Sequence in context: A092414 A139298 A004819 * A189308 A017415 A046246

Adjacent sequences:  A001372 A001373 A001374 * A001376 A001377 A001378

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified December 22 11:41 EST 2014. Contains 252355 sequences.