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A259107
Triangle read by rows: row n gives coefficients in an expansion of M_n*M_{-n}, where M_n = x^n+y^n+z^n and x,y,z satisfy x+y+z=0.
0
9, 0, 0, 2, 9, -3, 0, -8, 2, 0, 25, -5, 9, -12, -9, 2, 0, -49, 49, -7, 0, 96, -40, -8, 2, 9, -27, -135, 78, -9, 0, -150, 355, -100, -5, 2, 0, 242, -121, -242, 110, -11, 9, -48, -828, 892, -201, 0, 2, 0, -338, 1521, -507, -338, 143, -13
OFFSET
0,1
COMMENTS
Rows lengths are 1,1,2,2,3,3,4,4,...
REFERENCES
A. van Wijngaarden, On the coefficients of the modular invariant J(tau), Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, Series A, 56 (1953), 389-400
LINKS
A. van Wijngaarden, On the coefficients of the modular invariant J(tau), Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, Series A, 56 (1953), 389-400. [Annotated scanned copy]
EXAMPLE
Triangle begins:
9,
0,
0,2,
9,-3,
0,-8,2,
0,25,-5,
9,-12,-9,2,
0,-49,49,-7,
0,96,-40,-8,2,
9,-27,-135,78,-9,
0,-150,355,-100,-5,2,
0,242,-121,-242,110,-11,
9,-48,-828,892,-201,0,2,
0,-338,1521,-507,-338,143,-13,
...
CROSSREFS
Sequence in context: A276999 A223082 A318374 * A097671 A112628 A198871
KEYWORD
sign,tabf
AUTHOR
N. J. A. Sloane, Jun 24 2015
STATUS
approved