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A080961 Fourth binomial transform of the periodic sequence (1,5,1,1,5,1,...). +0
3
1, 9, 57, 321, 1713, 8889, 45417, 230001, 1158753, 5820009, 29178777, 146130081, 731358993, 3658920729, 18300980937, 91524036561, 457677578433, 2288560079049, 11443316955897, 57218134461441, 286095321353073 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n)=5*a(n-1)+4*3^(n-1) a(n)=3*5^n-2*3^n

CROSSREFS

Cf. A080960, A080962.

Sequence in context: A014916 A045635 A026896 this_sequence A102303 A009060 A112616

Adjacent sequences: A080958 A080959 A080960 this_sequence A080962 A080963 A080964

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 03 2003

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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