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A077272 a(n) = Sum_{d|n} d^2*2^(d-1)*(n/d-1) for n > 0. 1

%I

%S 0,0,1,2,11,4,57,6,159,80,441,10,1567,12,3197,958,8647,16,23301,18,

%T 53003,6508,124005,22,315755,1624,692345,41786,1615939,28,3795873,30,

%U 8414231,248200,18940065,14978,43126711,36,94634165,1384918,209905711,40,465656541

%N a(n) = Sum_{d|n} d^2*2^(d-1)*(n/d-1) for n > 0.

%F G.f.: Sum_{m>0} (m-1)*x^m*(1+2*x^m)/(1-2*x^m)^3. - _Vladeta Jovovic_, Jun 21 2003

%e a(4) = 1*1*3 + 4*2*1 + 16*8*0 = 11.

%Y Cf. A083413.

%K nonn

%O 0,4

%A _N. J. A. Sloane_, Jun 13 2003

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Last modified June 7 02:48 EDT 2020. Contains 334836 sequences. (Running on oeis4.)