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 A048093 #4 Mar 30 2012 18:56:54
%S A048093 0,1,2,5,9,14,20,27,83,119,164,219,285,363,454,1819,2379,3059,3875,
%T A048093 4844,5984,7314,8854,10625,53129,65779,80729,98279,118754,142505,
%U A048093 169910,201375,237335,278255,324631,1947791,2324783,2760680
%N A048093 Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= sqrt(n).
%Y A048093 Cf. A084919.
%K A048093 nonn
%O A048093 1,3
%A A048093 _Clark Kimberling_