A045696 - OEIS

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A045696

Number of ternary words of length n (beginning 0) with autocorrelation function 2^(n-1)+2.

0, 0, 0, 2, 6, 16, 54, 154, 480, 1418, 4302, 12836, 38670, 115802, 347868 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	FORMULA	`a[ 2n ] = 3 a[ 2n-1 ] - a[ n ] - a[ n+1 ] for n >= 3; a[ 2n-1 ] = 3 a[ 2n-2 ] + 3 a[ n ] for n >= 3`
	CROSSREFS	`Sequence in context: A136509 A100664 A003446 * A150028 A147730 A147729` `Adjacent sequences: A045693 A045694 A045695 * A045697 A045698 A045699`
	KEYWORD	`nonn`
	AUTHOR	`TORSTEN.SILLKE(AT)LHSYSTEMS.COM`

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Last modified February 16 17:46 EST 2012. Contains 205939 sequences.