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 A130586 #12 May 18 2019 16:57:59
%S A130586 1,3,9,19,65,75,385,531,1545,2115,10241,8283,49153,49539,131145,
%T A130586 262675,1048577,788043,4718593,4196435,12583305,20981763,92274689,
%U A130586 67117659,335544385,402702339,1207961097,1610662291,7516192769,4295100555
%N A130586 Row sums of triangle A130585.
%C A130586 A130584 row sums = A001792, the binomial transform of [1,2,3,...]: (1, 3, 8, 20, 48, 112, ...).
%F A130586 Row sums of A130585.
%F A130586 a(n-1) = Sum_{d|n} phi(n/d)*2^(n/d - 1). [_Olivier Gérard_, Jan 01 2012]
%e A130586 a(3) = 19 = sum of row 3 terms of A130585: (4 + 7 + 6 + 2).
%t A130586 Table[Plus@@Map[Function[d,EulerPhi[(n+1)/d] 2^((n+1)/d-1)],Divisors[n+1]],{n,0,30}] (* _Olivier Gérard_, Jan 01 2012 *)
%Y A130586 Cf. A130585, A001792, A130584.
%K A130586 nonn
%O A130586 0,2
%A A130586 _Gary W. Adamson_, Jun 06 2007
%E A130586 More terms from _Olivier Gérard_, Jan 01 2012