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 A054677 #10 Feb 14 2016 16:12:03 %S A054677 1,2,1,12,24,720,144,2016,40320,725760,3628800,47900160,239500800, %T A054677 276756480,17435658240,871782912000,4184557977600,711374856192000, %U A054677 43553562624000,57926238289920000,3649353012264960000,324386934423552000,1124000727777607680000 %N A054677 Denominator of expected length of longest increasing subsequence of a permutation of length n. %H A054677 Alois P. Heinz, <a href="/A054677/b054677.txt">Table of n, a(n) for n = 1..60</a> %H A054677 A. M. Odlyzko and E. M. Rains, <a href="http://www.dtc.umn.edu/~odlyzko/doc/probability.html">On longest increasing subsequences in random permutations</a>, pp. 439-451 in Analysis, Geometry, Number Theory: The Mathematics of Leon Ehrenpreis, E. L. Grinberg, S. Berhanu, M. Knopp, G. Mendoza and E. T. Quinto, eds., Amer. Math. Soc., Contemporary Math. #251, 2000. %Y A054677 Cf. A047874, A054676. %K A054677 nonn,frac,nice,easy %O A054677 1,2 %A A054677 Eric M. Rains (rains(AT)caltech.edu), Apr 19 2000 %E A054677 More terms from _Alois P. Heinz_, Feb 14 2016