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 A094117 #5 Mar 30 2012 18:39:22 %S A094117 0,1,1,2,2,3,3,10,16,23,29,36,42,49,49,50,50,51,51,52,52,59,65,72,78, %T A094117 85,91,98,98,99,99,100,100,101,101,108,114,121,127,134,140,147,147, %U A094117 148,148,149,149,150,150,199,247,296,344,393,441,490,532,575,617,660,702,745 %N A094117 Partial sums of A093349. %F A094117 a(7^k)=(49^k-1)/16 %o A094117 (PARI) a(n)=sum(k=1,n,-sum(i=1,k-1,(-1)^i*7^valuation(i,7))) %K A094117 nonn %O A094117 1,4 %A A094117 _Benoit Cloitre_, May 03 2004