A006329 - OEIS

%I M4728 #22 Nov 07 2017 18:15:49

%S 1,10,79,602,4682,38072,326570,2964992,28506383,289973248,3116028865,

%T 35308153600,421048783264,5273818620928,69250997724484,

%U 951571372015616,13658940616055885,204474999700324352,3187421031909630947,51663403849575956480

%N Total preorders.

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

%H G. Kreweras, <a href="http://www.numdam.org/item?id=MSH_1976__53__5_0">Les préordres totaux compatibles avec un ordre partiel</a>, Math. Sci. Humaines No. 53 (1976), 5-30.

%H G. Kreweras, <a href="/A019538/a019538.pdf">Les préordres totaux compatibles avec un ordre partiel</a>, Math. Sci. Humaines No. 53 (1976), 5-30. (Annotated scanned copy)

%Y A diagonal of A079502.

%K nonn

%O 3,2

%A _N. J. A. Sloane_

%E More terms from _Sean A. Irvine_, Mar 12 2017