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Search: id:A015580
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A015580 Linear 2nd order recurrence. +0
1
0, 1, 9, 85, 801, 7549, 71145, 670501, 6319089, 59553805, 561260601, 5289560629, 49851088065, 469818035101, 4427766668169, 41729172153925, 393273616058001, 3706379233137709, 34930507562471385 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n) = 9 a(n-1) + 4 a(n-2).

CROSSREFS

Adjacent sequences: A015577 A015578 A015579 this_sequence A015581 A015582 A015583

Sequence in context: A037686 A086627 A024118 this_sequence A108427 A142982 A029711

KEYWORD

nonn,easy

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.


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