This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A055534 #7 Mar 16 2021 08:30:30 %S A055534 1,86,2310,42960,712320,11481120,186671520,3116534400,53907638400, %T A055534 970417324800,18217668268800 %N A055534 Number of labeled order relations on n nodes in which longest chain has n-2 nodes. %D A055534 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 60. %Y A055534 A column or diagonal of triangle in A342587. %K A055534 nonn %O A055534 3,2 %A A055534 _N. J. A. Sloane_, Jul 10 2000 %E A055534 Extended to n=13 by _Brendan McKay_, Mar 16 2021