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 A138901 #11 Jul 09 2017 03:53:11 %S A138901 1,3,7,17,41,87,187,412,937,2162,5298,12354,29994,74094,182994,444354, %T A138901 1081419,2737788,6745792,16765802,41815827,105943891,261683475, %U A138901 655537299,1668304275 %N A138901 Partial sums of A094837. %C A138901 3, 7, 17, 41, 937 and 105943891 are primes. %e A138901 a(12) = 1 + 2 + 4 + 10 + 24 + 46 + 100 + 225 + 525 + 1225 + 3136 + 7056 = 12354. %Y A138901 Cf. A094837. %K A138901 nonn %O A138901 1,2 %A A138901 _Jonathan Vos Post_, May 16 2008 %E A138901 a(4)=17 added and a(13)-a(25) from _Akshay Bansal_, Jul 08 2017