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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

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Last modified July 28 14:41 EDT 2014. Contains 245001 sequences.