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Search: id:A081680
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A081680 A sum of decreasing powers. +0
3
1, 2, 4, 23, 274, 2927, 27094, 228923, 1827634, 14069687, 105715534, 781107923, 5702856394, 41273440847, 296753044774, 2122921300523, 15127554995554, 107462125890407, 761485887090814, 5385095865086723, 38019827430709114 (list; graph; listen)
OFFSET

0,2

COMMENT

Binomial transform of A081679

FORMULA

a(n)=(7^n-6^n-5^n-4^n+4*3^n)/2

CROSSREFS

Cf. A081681.

Adjacent sequences: A081677 A081678 A081679 this_sequence A081681 A081682 A081683

Sequence in context: A133834 A009313 A009317 this_sequence A090591 A098656 A138611

KEYWORD

easy,nonn

AUTHOR

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

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.


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