id:A117855 - OEIS Search Results

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Number of palindromes of length n (in base 3).

+0
1

2, 2, 6, 6, 18, 18, 54, 54, 162, 162, 486, 486 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = 2*3^floor((n-1)/2)`
	CROSSREFS	`Cf. A050683.` `Sequence in context: A140833 A071908 A011260 this_sequence A086442 A071407 A109859` `Adjacent sequences: A117852 A117853 A117854 this_sequence A117856 A117857 A117858`
	KEYWORD	`nonn`
	AUTHOR	`Martin Renner (martin.renner(AT)gmx.net), May 02 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.