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 A285868 #9 May 10 2017 11:36:03
%S A285868 1,1,4,20,126,962,8646,89546,1051350,13811642,200866326,3205348346,
%T A285868 55704133590,1047489675962,21195507649686,459258707587706,
%U A285868 10610386574074710,260385846630175802,6764666952807962646
%N A285868 Row sums of triangle A285867.
%C A285868 See A285867 for details.
%F A285868 a(n) = Sum_{k=0..n} A285867(n, k).
%F A285868 a(n) = 1 for n = 0 and A000629(n) - n! for n >= 1.
%Y A285868 Cf. A000629, A285867.
%K A285868 nonn,easy
%O A285868 0,3
%A A285868 _Wolfdieter Lang_, May 04 2017