%I #7 Mar 16 2021 08:30:30
%S 1,86,2310,42960,712320,11481120,186671520,3116534400,53907638400,
%T 970417324800,18217668268800
%N Number of labeled order relations on n nodes in which longest chain has n-2 nodes.
%D L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 60.
%Y A column or diagonal of triangle in A342587.
%K nonn
%O 3,2
%A _N. J. A. Sloane_, Jul 10 2000
%E Extended to n=13 by _Brendan McKay_, Mar 16 2021