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A006329 Total preorders.
(Formerly M4728)
0
1, 10, 79, 602, 4682, 38072, 326570, 2964992, 28506383, 289973248, 3116028865, 35308153600, 421048783264, 5273818620928, 69250997724484, 951571372015616, 13658940616055885, 204474999700324352, 3187421031909630947, 51663403849575956480 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

REFERENCES

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=3..22.

G. Kreweras, Les préordres totaux compatibles avec un ordre partiel, Math. Sci. Humaines No. 53 (1976), 5-30.

G. Kreweras, Les préordres totaux compatibles avec un ordre partiel, Math. Sci. Humaines No. 53 (1976), 5-30. (Annotated scanned copy)

CROSSREFS

A diagonal of A079502.

Sequence in context: A288630 A081905 A016138 * A077245 A036732 A251309

Adjacent sequences:  A006326 A006327 A006328 * A006330 A006331 A006332

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Sean A. Irvine, Mar 12 2017

STATUS

approved

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Last modified November 12 04:21 EST 2019. Contains 329051 sequences. (Running on oeis4.)