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A085277 Expansion of (1+x)^2/((1-2x)(1-3x)). 2
1, 7, 30, 108, 360, 1152, 3600, 11088, 33840, 102672, 310320, 935568, 2815920, 8466192, 25435440, 76380048, 229287600, 688157712, 2065062960, 6196368528, 18591464880, 55779113232, 167346776880, 502059205008, 1506215363760 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Inverse binomial transform of A016208. Binomial transform of A085278.
LINKS
FORMULA
a(n)=16*3^n/3+0^n/6-9*2^n/2.
a(0)=1, a(1)=7, a(2)=30, a(n)=5*a(n-1)-6*a(n-2). - Harvey P. Dale, Sep 30 2012
MATHEMATICA
CoefficientList[Series[(1+x)^2/((1-2x)(1-3x)), {x, 0, 30}], x] (* or *) Join[{1}, LinearRecurrence[{5, -6}, {7, 30}, 30]] (* Harvey P. Dale, Sep 30 2012 *)
CROSSREFS
Sequence in context: A062455 A364655 A368528 * A269084 A055269 A026631
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 25 2003
STATUS
approved

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Last modified May 23 18:34 EDT 2024. Contains 372765 sequences. (Running on oeis4.)