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 A174803 #15 Jul 30 2022 08:17:38
%S A174803 0,2,4,5,8,11,12,13,14,18,22,23,24,25,26,27,32,37,38,39,40,41,42,43,
%T A174803 44,50,56,57,58,59,60,61,62,63,64,65,72,79,80,81,82,83,84,85,86,87,88,
%U A174803 89,90,98,106,107,108,109,110,111,112,113,114,115,116,117,118,119,128,137
%N A174803 a(n) = n + ceiling(sqrt(n))*floor(sqrt(n)).
%F A174803 a(n) = n + A038759(n). - _Robert G. Wilson v_, Apr 17 2010
%F A174803 a(n^2) = 2*n^2. - _Bernard Schott_, Jul 30 2022
%t A174803 f[n_]:=n+Floor[Sqrt[n]]*Ceiling[Sqrt[n]];Table[f[n],{n,0,5!}]
%Y A174803 Cf. A038759, A038760.
%Y A174803 Cf. A000290 (n^2), A001105 (2*n^2).
%K A174803 nonn,easy
%O A174803 0,2
%A A174803 _Vladimir Joseph Stephan Orlovsky_, Mar 29 2010