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A282017 Coefficients in q-expansion of (E_4 + E_2^2)/2, where E_2 and E_4 are the Eisenstein series shown in A006352 and A004009, respectively. 0
1, 96, 1296, 4992, 13488, 25920, 50112, 74496, 123120, 164832, 246240, 300672, 442176, 501312, 694656, 794880, 1052016, 1135296, 1534032, 1591680, 2086560, 2214912, 2763072, 2840832, 3723840, 3668640, 4590432, 4750080, 5801088, 5728320, 7309440, 7007232, 8697456, 8722944, 10349856, 10160640 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..35.

MAPLE

with(numtheory); M:=100;

E := proc(k) local n, t1; global M;

t1 := 1-(2*k/bernoulli(k))*add(sigma[k-1](n)*q^n, n=1..M+1);

series(t1, q, M+1); end;

e2:=E(2); e4:=E(4); e6:=E(6);

series((e2^2+e4)/2, q, M+1);

seriestolist(%);

CROSSREFS

Cf. A004009 and A006352.

Sequence in context: A232918 A187165 A229533 * A263567 A223292 A168526

Adjacent sequences:  A282014 A282015 A282016 * A282018 A282019 A282020

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 05 2017

STATUS

approved

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Last modified May 18 05:58 EDT 2022. Contains 353783 sequences. (Running on oeis4.)