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A208150 Expansion of (1 + 2*Product_{i>=1} (1 + x^(8*i - 1)))/(-1 + Product_{i>=1} (1 - x^(8*i - 1))). 0
-2, 3, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, -4, 3, 0, 0, 0, 0, 0, 0, -3, -3, 0, 0, 0, 0, 0, -4, 2, 3, 0, 0, 0, 0, 0, -3, -9, -3, 0, 0, 0, 0, -4, 1, 5, 3, 0, 0, 0, 0, 1, -15, -9, -3, 0, 0, 0, -4, 0, 6, 5, 3, 0, 0, 0, 5, -20, -21, -12, -3, 0, 0, -4, -1, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..77.

EXAMPLE

-3/x^7 - 2 + 3*x -3*x^8 - 4*x^15 + 3*x^16 - 3*x^23 - 3*x^24 - 4*x^30 + ...

MATHEMATICA

Table[SeriesCoefficient[

Series[(1 + 2*Product[1 + x^(8*i - 1), {i, 1, Infinity}])/(-1 +

Product[(1 - x^(8*i - 1)), {i, 1, Infinity}]), {x, 0, 100}],

n], {n, 0, 100}]

CROSSREFS

Cf. A207944, A080054, A142724.

Sequence in context: A230807 A173012 A083925 * A045830 A078771 A072771

Adjacent sequences: A208147 A208148 A208149 * A208151 A208152 A208153

KEYWORD

sign,less

AUTHOR

Roger L. Bagula, Feb 23 2012

STATUS

approved

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Last modified February 3 17:00 EST 2023. Contains 360044 sequences. (Running on oeis4.)