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 A324915 #11 Feb 16 2025 08:33:58
%S A324915 2,14,46,158,350,1118,2142,5982,12638,31070,55646,170334,285022,
%T A324915 678238,1464670,3496286,5855582,16079198,26564958,70605150,137714014,
%U A324915 288708958,490035550,1496668510,2536855902,5355428190,10724137310,25756522846,41862650206,119172061534
%N A324915 a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).
%H A324915 Vaclav Kotesovec, <a href="/A324915/a324915.jpg">Plot of a(n)/(n*2^n) for n = 1..100000</a>
%H A324915 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/DivisorFunction.html">Divisor Function</a>
%t A324915 Accumulate[Table[2^k*DivisorSigma[1, k], {k, 1, 30}]]
%Y A324915 Cf. A000203, A024916, A185003, A324914.
%K A324915 nonn
%O A324915 1,1
%A A324915 _Vaclav Kotesovec_, Mar 18 2019