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Search: id:A055989
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A055989 a(n) is its own 4th difference. +0
4
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; listen)
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.

Adjacent sequences: A055986 A055987 A055988 this_sequence A055990 A055991 A055992

Sequence in context: A075316 A047122 A047107 this_sequence A102871 A119374 A126188

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 October 12 15:26 EDT 2008. Contains 144830 sequences.


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