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 A081533 #4 Dec 05 2013 19:56:02 %S A081533 1,3,7,12,31,28,127,60,91,124,2047,168,8191,508,403,360,131071,546, %T A081533 524287,744,1651,8188,8388607,1170,3751,32764,2821,3048,536870911, %U A081533 2418,2147483647,2880,26611,524284,15367,4368,137438953471,2097148,106483 %N A081533 Sum of terms in row n of A081532. %F A081533 a(n) = sigma(A005179(n)). %Y A081533 Cf. A005179, A081532. %K A081533 nonn %O A081533 1,2 %A A081533 _Amarnath Murthy_, Mar 28 2003 %E A081533 More terms from _David Wasserman_, Jun 07 2004