id:A000116 - OEIS Search Results

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Number of even sequences with period 2n (bisection of A000013).
(Formerly M1156 N0440)

+0
3

1, 2, 4, 8, 20, 56, 180, 596, 2068, 7316, 26272, 95420, 349716, 1290872, 4794088, 17896832, 67110932, 252648992, 954444608, 3616828364, 13743921632, 52357746896, 199911300472, 764877836468, 2932031358484, 11258999739560, 43303843861744, 166799988689300 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`E. N. Gilbert and J. Riordan, Symmetry types of periodic sequences, Illinois J. Math., 5 (1961), 657-665.`
	CROSSREFS	`Cf. A000013, A026119.` `Adjacent sequences: A000113 A000114 A000115 this_sequence A000117 A000118 A000119` `Sequence in context: A123611 A082279 A113180 this_sequence A006407 A100447 A112278`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from David W. Wilson (davidwwilson(AT)comcast.net) Jan 13 2000.`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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