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 A348391 #6 Dec 13 2021 17:07:06
%S A348391 3,7,18,24,48,56,87,109,147,159,235,249,301,355,434,452,563,583,705,
%T A348391 779,859,883,1087,1143,1237,1331,1499,1529,1781,1813,2004,2118,2240,
%U A348391 2358,2701,2739,2875,3009,3339,3381,3729,3773
%N A348391 Row sums of irregular triangle A348390.
%F A348391 a(n) = Sum_{m=1..2*A002541(n)} A348390(n, m), for n >= 2.
%F A348391 a(n) = A153485(n) + A348392(n).
%e A348391 a(5) = 2 + 3 + 4 + 5 + 1 + 4 + 1 + 1 + 2 + 1 = (1 + 1 + 1 + 2 + 1) + (2 + 3 + 4 + 5 + 4) = 6 + 18 = 24.
%t A348391 nterms=50;Table[Total[Flatten[Table[Join[Most[Divisors[k]],Range[2k,n,k]],{k,n}]]],{n,2,nterms+1}] (* _Paolo Xausa_, Nov 23 2021 *)
%Y A348391 Cf. A002541, A348390.
%K A348391 nonn,easy
%O A348391 2,1
%A A348391 _Wolfdieter Lang_, Nov 07 2021