A006329 Total preorders.

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

Offset: 3

Author

N. J. A. Sloane

Keywords

• nonn

References

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

Links

• 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.

Extensions

More terms from Sean A. Irvine, Mar 12 2017