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 A125023 #8 Sep 29 2021 10:49:52
%S A125023 1,2,5,12,31,78,208,551,1502,4117,11435,31926,89829,253727,719926,
%T A125023 2048919,5848543,16732592,47973762,137788720,396393362,1141962118,
%U A125023 3294080424,9512949813,27501182865,79579492065,230478715333
%N A125023 Partial sums of A001372.
%F A125023 a(n) = Sum_{i=0..n} A001372(i).
%Y A125023 Cf. A001372, A125024.
%K A125023 easy,nonn
%O A125023 0,2
%A A125023 _Jonathan Vos Post_, Nov 15 2006
%E A125023 More terms from _R. J. Mathar_, Sep 23 2007