A055989 - OEIS

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A055989

a(n) is its own 4th difference.

1, 3, 10, 36, 131, 476, 1728, 6272, 22765, 82629, 299915, 1088589, 3951206, 14341527, 52054840, 188941273, 685792227, 2489191330, 9034913540, 32793647355, 119029728628, 432037221840, 1568147413312, 5691839002677 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n)=5a(n-1)-6a(n-2)+4a(n-3)-a(n-4) =a(n-1)+A055988(n) =A055990(n)-A055990(n-1) =A055991(n)-2*A055991(n-1)+A055991(n-2)`
	CROSSREFS	`Cf. A055988, A055990, A055991 for the other differences of a(n). See A000079, A001906, A052529 for examples of sequences which are respectively their own first, second and third differences.` `Sequence in context: A047122 A047107 A149040 * A102871 A119374 A126188` `Adjacent sequences: A055986 A055987 A055988 * A055990 A055991 A055992`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 02 2000`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jun 05 2000`

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Last modified February 16 08:13 EST 2012. Contains 205893 sequences.