A006329 Total preorders. (Formerly M4728)

1, 10, 79, 602, 4682, 38072, 326570, 2964992, 28506383, 289973248, 3116028865, 35308153600, 421048783264, 5273818620928, 69250997724484, 951571372015616, 13658940616055885, 204474999700324352, 3187421031909630947, 51663403849575956480

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