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A081034 7th binomial transform of the periodic sequence (1,8,1,1,8,1...). 3
1, 15, 162, 1548, 13896, 120240, 1016352, 8457408, 69618816, 568707840, 4620206592, 37384915968, 301618907136, 2428188733440, 19516934725632, 156684026953728, 1256763510521856, 10073855853527040, 80709333444329472 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)=8*a(n-1)+7*6^(n-1) a(n)=(9/2)*8^n-(7/2)6^n.

CROSSREFS

Cf. A081033, A081035.

Sequence in context: A095685 A067361 A014920 * A016243 A164599 A016291

Adjacent sequences:  A081031 A081032 A081033 * A081035 A081036 A081037

KEYWORD

easy,nonn

AUTHOR

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

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Last modified February 15 16:39 EST 2012. Contains 205823 sequences.