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 A173449 #7 Aug 28 2020 06:16:18
%S A173449 1,3,7,18,85,2364,2600425,3374964379317,5695183504495988993642596,
%T A173449 16217557574922386301420542667438374091771757190157,
%U A173449 131504586847961235687181874578063117114329409897631406061666638548823646377599560502379804093488299
%N A173449 Partial sums of A006894.
%F A173449 a(n) = Sum_{i=1..n} A006894(i).
%Y A173449 Cf. A006894.
%K A173449 nonn
%O A173449 1,2
%A A173449 _Jonathan Vos Post_, Feb 18 2010
%E A173449 a(11) corrected by _Georg Fischer_, Aug 28 2020