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A165147 a(n) = (3*7^n-3^n)/2. 2
1, 9, 69, 501, 3561, 25089, 176109, 1234221, 8643921, 60520569, 423683349, 2965901541, 20761665081, 145332718449, 1017332217789, 7121335090461, 49849374331041, 348945706410729, 2442620203155429, 17098342196928981 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Partial sums are in A016138.
Binomial transform of A016129. Inverse binomial transform of A165148.
LINKS
FORMULA
a(n) = 10*a(n-1)-21*a(n-2) for n > 1; a(0) = 1, a(1) = 9.
G.f.: (1-x)/((1-3*x)*(1-7*x)).
PROG
(Magma) [ (3*7^n-3^n)/2: n in [0..19] ];
CROSSREFS
Sequence in context: A297593 A198691 A125372 * A075045 A361139 A081616
KEYWORD
nonn,easy
AUTHOR
Klaus Brockhaus, Sep 15 2009
STATUS
approved

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Last modified October 3 16:48 EDT 2023. Contains 365868 sequences. (Running on oeis4.)