

A011779


Expansion of 1/((1x)^3*(1x^3)^2).


4



1, 3, 6, 12, 21, 33, 51, 75, 105, 145, 195, 255, 330, 420, 525, 651, 798, 966, 1162, 1386, 1638, 1926, 2250, 2610, 3015, 3465, 3960, 4510, 5115, 5775, 6501, 7293, 8151, 9087, 10101, 11193, 12376, 13650
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OFFSET

0,2


COMMENTS

The Ca2 and Ze4 triangle sums of A139600 are related to the sequence given above, e.g., Ze4(n) = A011779(n1)  A011779(n2)  A011779(n4) + 3*A011779(n5), with A011779(n) = 0 for n <= 1. For the definitions of these triangle sums see A180662. [Johannes W. Meijer, Apr 29 2011]


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (3,3,3,6,6,3,3,3,1).


MATHEMATICA

CoefficientList[Series[1 / ((1  x)^3 (1  x^3)^2), {x, 0, 100}], x] (* Vincenzo Librandi, Jun 23 2013 *)


PROG

(PARI) Vec(1/((1x)^3*(1x^3)^2)+O(x^99)) \\ Charles R Greathouse IV, Sep 25 2012


CROSSREFS

Cf. A236770 (first trisection, except 0).
Sequence in context: A053479 A290768 A070333 * A161809 A084439 A034344
Adjacent sequences: A011776 A011777 A011778 * A011780 A011781 A011782


KEYWORD

nonn,easy


AUTHOR

Emeric Deutsch


STATUS

approved



