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Search: id:A015570
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A015570 Linear 2nd order recurrence. +0
1
0, 1, 7, 60, 497, 4139, 34440, 286609, 2385103, 19848420, 165175073, 1374558131, 11438832720, 95191968481, 792170939287, 6592308228300, 54860037930257, 456535656023099, 3799210009394520, 31616362282015729 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n) = 7 a(n-1) + 11 a(n-2).

a(n)=(1/93)*[7/2+(1/2)*sqrt(93)]^n*sqrt(93)-(1/93)*[7/2-(1/2)*sqrt(93)]^n*sqrt(93) , with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 25 2008

CROSSREFS

Sequence in context: A077409 A099347 A063969 this_sequence A024090 A043085 A079672

Adjacent sequences: A015567 A015568 A015569 this_sequence A015571 A015572 A015573

KEYWORD

nonn,easy

AUTHOR

Olivier Gerard (ogerard(AT)ext.jussieu.fr)

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


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