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Search: id:A081684
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A081684 A sum of decreasing powers. +0
2
1, -1, -1, 29, 275, 1829, 10739, 59429, 318275, 1670789, 8656979, 44454629, 226827875, 1151991749, 5830280819, 29429454629, 148249811075, 745630312709, 3745590106259, 18797445635429, 94264432179875, 472428649241669, 2366562219717299, 11850466059333029 (list; graph; listen)
OFFSET

0,4

COMMENT

Inverse binomial transform of A081685

FORMULA

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

CROSSREFS

Adjacent sequences: A081681 A081682 A081683 this_sequence A081685 A081686 A081687

Sequence in context: A042634 A120823 A110692 this_sequence A142033 A142905 A124310

KEYWORD

easy,sign

AUTHOR

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

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.


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