

A123009


Expansion of x * (5*x+1) / (49*x^2+2*x1).


0



1, 7, 63, 469, 4025, 31031, 259287, 2039093, 16783249, 133482055, 1089343311, 8719307317, 70816436873, 568878932279, 4607763271335, 37090594224341, 299961588744097, 2417362294480903, 19532842437422559, 157516437304409365
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..20.
Index entries for linear recurrences with constant coefficients, signature (2,49).


FORMULA

a(n) = 2*a(n1)+49*a(n2) for n>2. G.f.: x*(5*x+1)/(49*x^2+2*x1). [Colin Barker, Oct 19 2012]


MATHEMATICA

M := {{0, 1}, {1, 2/7}}; v[1] = {1, 1}; v[n_] := v[n] = M.v[n  1]; a = Table[v[n][[1]]*7^(n  1), {n, 1, 30}]


CROSSREFS

Cf. A002534.
Sequence in context: A043027 A165759 A166153 * A219058 A182603 A218191
Adjacent sequences: A123006 A123007 A123008 * A123010 A123011 A123012


KEYWORD

nonn,easy


AUTHOR

Roger L. Bagula and Gary W. Adamson, Sep 23 2006


EXTENSIONS

Sequence edited by Joerg Arndt and Colin Barker, Oct 19 2012.


STATUS

approved



