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1, 4, 9, 19, 37, 75, 149, 299, 597, 1195, 2389, 4779, 9557, 19115, 38229, 76459, 152917, 305835, 611669, 1223339, 2446677, 4893355, 9786709, 19573419, 39146837, 78293675, 156587349, 313174699, 626349397, 1252698795, 2505397589, 5010795179, 10021590357, 20043180715
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Michael De Vlieger, Table of n, a(n) for n = 0..3320
Index entries for linear recurrences with constant coefficients, signature (1,2).
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FORMULA
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Inverse binomial transform of A133648.
From R. J. Mathar, Dec 13 2008: (Start)
a(n) = A062092(n), n > 1.
G.f.: (1+2x)*(1+x+x^2)/((1-2x)*(1+x)). (End)
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EXAMPLE
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a(3) = (-1, 3, -3, 1) dot (1, 5, 18, 59) = (-1, 15, -54, 59), where A133648 = (1, 5, 18, 59, 184, 561, ...).
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MATHEMATICA
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CoefficientList[Series[(1 + 2 x) (1 + x + x^2)/((1 - 2 x) (1 + x)), {x, 0, 33}], x] (* Michael De Vlieger, Mar 23 2022 *)
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CROSSREFS
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Cf. A007318, A062092, A133648.
Sequence in context: A301080 A232623 A002804 * A301088 A301089 A177144
Adjacent sequences: A133646 A133647 A133648 * A133650 A133651 A133652
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson, Sep 19 2007
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STATUS
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approved
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