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 A192676 #7 Apr 04 2024 16:41:07
%S A192676 1,0,1,1,3,6,16,43,121,365,1155,3832,13274,47862,179084,693589,
%T A192676 2774358,11438972,48531450,211543687,946052129,4335355493,20334619731,
%U A192676 97521410321,477755388567,2388776942837,12180420245150,63291320166423,334906186618646,1803525009870353
%N A192676 Floor-Sqrt transform of derangement numbers (A000166).
%F A192676 a(n) = floor(sqrt(derangements(n))).
%t A192676 FSFromExpSeries[f_,x_,n_] := Map[Floor[Sqrt[#]]&,CoefficientList[Series[f,{x,0,n}],x]Table[k!,{k,0,n}]]
%t A192676 FSFromExpSeries[Exp[-x]/(1-x),x,100]
%Y A192676 Cf. A000166.
%K A192676 nonn
%O A192676 0,5
%A A192676 _Emanuele Munarini_, Jul 07 2011