A282596 Coefficients in q-expansion of E_2*E_4^2*E_6, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.

1, -48, -196128, -33542976, -678319104, 12136422240, 509314518144, 7469015889792, 68272650653760, 458377820557584, 2454769903187520, 11035857376010304, 43103740076823552, 149954656815201504, 473331019057949952, 1375248429330791040, 3719662610125117632

Offset

0,2

Links

Seiichi Manyama, Table of n, a(n) for n = 0..1000

Mathematica

terms = 17;
E2[x_] = 1 - 24*Sum[k*x^k/(1 - x^k), {k, 1, terms}];
E4[x_] = 1 + 240*Sum[k^3*x^k/(1 - x^k), {k, 1, terms}];
E6[x_] = 1 - 504*Sum[k^5*x^k/(1 - x^k), {k, 1, terms}];
E2[x]* E4[x]^2 *E6[x] + O[x]^terms // CoefficientList[#, x]& (* Jean-François Alcover, Feb 27 2018 *)

Crossrefs

Cf. A282102 (E_2*E_4*E_6), A282547 (E_2*E_4*E_6^2).

Sequence in context: A228143 A008704 A037947 * A272262 A146204 A269561

Adjacent sequences: A282593 A282594 A282595 * A282597 A282598 A282599

Keyword

sign

Author

Seiichi Manyama, Feb 19 2017

Status

approved