



1, 14, 63, 364, 2429, 16842, 117691, 823592, 5764857, 40353670, 282475319, 1977326820, 13841287285, 96889010498, 678223072947, 4747561510048, 33232930569713, 232630513987326, 1628413597910575
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OFFSET

0,2


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..500
Index entries for linear recurrences with constant coefficients, signature (9,15,7).


FORMULA

G.f.: (1+5*x48*x^2)/((1x)^2*(17*x)).
a(n) = 9*a(n1)15*a(n2)+7*a(n3).
a(n) = A176972(n)  1.


MATHEMATICA

Table[(7^n + 7 n), {n, 0, 30}] (* or *) CoefficientList[Series[(1 + 5 x  48 x^2)/((1  x)^2 (1  7 x)), {x, 0, 30}], x]


PROG

(MAGMA) [7^n + 7*n: n in [0..30]]; /* or */ I:=[1, 14, 63]; [n le 3 select I[n] else 9*Self(n1)15*Self(n2)+7*Self(n3): n in [1..30]];
(PARI) a(n)=7^n+7*n \\ Charles R Greathouse IV, Apr 18 2013


CROSSREFS

Cf. A198397, A176972.
Sequence in context: A050492 A255499 A229739 * A229738 A239856 A214483
Adjacent sequences: A221906 A221907 A221908 * A221910 A221911 A221912


KEYWORD

nonn,easy


AUTHOR

Vincenzo Librandi, Mar 02 2013


STATUS

approved



