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 A192661 #11 Jan 13 2025 16:28:19
%S A192661 1,1,2,9,41,206,1150,7023,46279,325845,2432608,19138508,157893016,
%T A192661 1360356046,12197663221,113489506443,1092914231524,10869407462093,
%U A192661 111421588497433,1175241503062627,12735340966302227,141585732942425447,1612917155538690101
%N A192661 Floor-Sqrt transform of central Stirling numbers of the second kind (A007820).
%F A192661 a(n) = floor(sqrt(Stirling2(2*n,n))).
%t A192661 Table[Floor[Sqrt[StirlingS2[2n,n]]],{n,0,100}]
%o A192661 (Maxima) makelist(floor(sqrt(stirling2(2*n,n))),n,0,24);
%Y A192661 Cf. A007820.
%K A192661 nonn
%O A192661 0,3
%A A192661 _Emanuele Munarini_, Jul 07 2011