id:A161520 - OEIS Search Results

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Expansion of Sum_{n >= 1} q^n(1-q)(1-q^2)...(1-q^(2n-1))/((1+q^2)(1+q^4)...(1+q^(2n))).

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1, 0, -1, -1, 0, 0, 0, 0, 1, 2, 0, -1, 0, 0, 0, -1, 0, 0, -2, 0, 0, 0, 0, 0, 3, 0, -1, 0, 0, 2, 0, 0, 0, 0, 0, -1, 0, 0, 0, -2, 0, 0, -2, 0, 0, 2, 0, -1, 1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, -1, 0, 0, -2, 0, 0, 0, 0, 0, 2, 0, -3, -2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 2, 0, 0 (list; graph; listen)

	OFFSET	`1,10`
	COMMENT	`a(n) is -(-1)^(n(n+1)/2) times the number of inequivalent elements of norm n in Z[sqrt{6}].`
	REFERENCES	`Jeremy Lovejoy, Overpartitions and real quadratic fields, J. Number Theory, 106 (2004), 178-186.`
	CROSSREFS	`Sequence in context: A113048 A123758 A069846 this_sequence A070097 A096271 A034876` `Adjacent sequences: A161517 A161518 A161519 this_sequence A161521 A161522 A161523`
	KEYWORD	`sign`
	AUTHOR	`Jeremy Lovejoy (lovejoy(AT)liafa.jussieu.fr), Jun 12 2009`

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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

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