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 A056549 #9 May 03 2019 17:35:07
%S A056549 0,2,5,9,12,17,21,25,30,35,39,45,49,54,60,66,69,75,82,86,92,98,102,
%T A056549 110,114,120,126,132,138,144,150,154,161,169,173,181,186,190,198,206,
%U A056549 210,217,223,229,235,243,249,255,261,266,275,281,285,295,301,307,313,319
%N A056549 a(n) = Sum_{k>=1} round(n/k) where round(1/2)=1.
%F A056549 a(n) = A056548(n) + A001227(n).
%F A056549 Conjecture: a(n) = n + Sum_{k=1..n} floor(n/k + 1/2) = n + A077024(n). - _Ridouane Oudra_, Apr 29 2019
%Y A056549 Cf. A001227, A006218, A056548, A077024.
%K A056549 easy,nonn
%O A056549 0,2
%A A056549 _Henry Bottomley_, Jun 21 2000