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Search: id:A081687
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A081687 A sum of decreasing powers. +0
3
1, 2, 2, 20, 542, 8132, 94502, 964700, 9138782, 82619732, 724180502, 6213565580, 52507598222, 438786732932, 3636161064902, 29939329241660, 245281233244862, 2001531240407732, 16280816416067702, 132088684297864940 (list; graph; listen)
OFFSET

0,2

COMMENT

Binomial transform of A081686

FORMULA

a(n)=8^n-7^n-6^n-5^n+3*4^n

CROSSREFS

Cf. A081690.

Sequence in context: A053593 A002907 A134046 this_sequence A082811 A014353 A153438

Adjacent sequences: A081684 A081685 A081686 this_sequence A081688 A081689 A081690

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 30 2003

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Last modified March 18 15:35 EDT 2010. Contains 173617 sequences.


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