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 A344552 #3 May 22 2021 18:02:20
%S A344552 0,0,0,1,2,3,4,6,10,12,14,17,22,25,28,34,40,46,50,55,62,69,74,80,94,
%T A344552 100,108,115,126,133,142,152,164,176,184,197,210,221,230,242,260,272,
%U A344552 286,297,314,327,340,354,378,394,406,423,442,459,472,488,512,532,548,563,590,607
%N A344552 a(n) = Sum_{k=1..n} floor(k*(n-k)/n).
%t A344552 Table[Sum[Floor[k (n - k)/n], {k, n}], {n, 80}]
%Y A344552 Cf. A006218, A344514, A344551.
%K A344552 nonn
%O A344552 1,5
%A A344552 _Wesley Ivan Hurt_, May 22 2021