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A305102 G.f.: Sum_{k>=1} x^k/(1-x^k) * Product_{k>=1} (1+x^k)/(1-x^k). 8

%I #9 Jun 18 2020 03:24:53

%S 0,1,4,10,23,46,88,158,274,459,748,1190,1858,2846,4292,6384,9373,

%T 13602,19536,27782,39158,54740,75928,104562,143036,194423,262704,

%U 352988,471778,627382,830352,1093994,1435132,1874920,2439832,3163020,4085825,5259602,6748136

%N G.f.: Sum_{k>=1} x^k/(1-x^k) * Product_{k>=1} (1+x^k)/(1-x^k).

%C Convolution of A006128 and A000009.

%C Convolution of A305082 and A000041.

%C Convolution of A000005 and A015128.

%C a(n) is the number of non-overlined parts in all overpartitions of n. - _Joerg Arndt_, Jun 18 2020

%H Vaclav Kotesovec, <a href="/A305102/b305102.txt">Table of n, a(n) for n = 0..10000</a>

%F a(n) ~ exp(Pi*sqrt(n)) * (2*gamma + log(4*n/Pi^2)) / (8*Pi*sqrt(n)), where gamma is the Euler-Mascheroni constant A001620.

%t nmax = 40; CoefficientList[Series[Sum[x^k/(1-x^k), {k, 1, nmax}] * Product[(1+x^k)/(1-x^k), {k, 1, nmax}], {x, 0, nmax}], x]

%o (PARI) my(N=44, q='q+O('q^N)); Vec( prod(k=1,N, (1+q^k)/(1-q^k)) * sum(k=1,N, 1*q^k/(1-q^k)) ) \\ _Joerg Arndt_, Jun 18 2020

%Y Cf. A006128, A015723, A209423, A305082, A305101.

%Y Cf. A335651 and A335666.

%K nonn

%O 0,3

%A _Vaclav Kotesovec_, May 25 2018

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Last modified September 18 01:28 EDT 2024. Contains 375995 sequences. (Running on oeis4.)