id:A013914 - OEIS Search Results

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Number of distinct nonzero absolute values of sum_{j=1}^n \sigma_j \exp( i \pi j / n ) where \sigma_j = +- 1.

+0
1

1, 1, 1, 2, 3, 4, 8, 12, 16, 33, 62, 67, 186, 316, 280, 1040, 1963, 1702, 6830, 10751, 8679, 45838, 88255, 56292, 264838, 624778 (list; graph; listen)

	OFFSET	`0,4`
	LINKS	`J. M. Borwein, D. M. Bradley and D. J. Broadhurst, Evaluations of k-fold Euler/Zagier sums..., Electron. J. Combinatorics, 4 (No. 2, 1997) #N5.`
	CROSSREFS	`Adjacent sequences: A013911 A013912 A013913 this_sequence A013915 A013916 A013917` `Sequence in context: A062923 A133464 A085635 this_sequence A060200 A057608 A060984`
	KEYWORD	`nonn,nice`
	AUTHOR	`David Broadhurst (D.Broadhurst(AT)open.ac.uk)`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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