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 A192684 #7 Apr 28 2025 16:12:27
%S A192684 1,1,1,1,2,2,4,6,9,13,20,31,47,73,112,174,269,418,651,1015,1586,2481,
%T A192684 3886,6095,9571,15048,23684,37312,58837,92857,146667,231831,366707,
%U A192684 580438,919314,1456898,2310137,3665024,5817475,9238469,14677875,23329993,37097578,59013025,93910464,149498476
%N A192684 Floor-Sqrt transform of numbers of A004148 (secondary structures).
%F A192684 a(n) = floor(sqrt(A004148(n))).
%t A192684 FSFromSeries[f_,x_,n_] := Map[Floor[Sqrt[#]]&,CoefficientList[Series[f,{x,0,n}],x]]
%t A192684 FSFromSeries[(1-x+x^2-Sqrt[1-2x-x^2-2x^3+x^4])/(2x^2),x,100]
%K A192684 nonn
%O A192684 0,5
%A A192684 _Emanuele Munarini_, Jul 07 2011