A117863 - OEIS

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A117863

Number of palindromes (in base 4) below 4^n.

3, 6, 18, 30, 78, 126, 318, 510, 1278, 2046 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n) = 54^((n-1)/2)-2 (n odd), 24^(n/2)-2 (n even).`
	CROSSREFS	`Cf. A050250.` `Sequence in context: A174101 A088339 A064400 * A103100 A101726 A034457` `Adjacent sequences: A117860 A117861 A117862 * A117864 A117865 A117866`
	KEYWORD	`nonn,base`
	AUTHOR	`Martin Renner (martin.renner(AT)gmx.net), May 02 2006`

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.