

A119306


Expansion of (14x)/(1x(1x)^3).


1



1, 3, 6, 6, 14, 19, 37, 56, 96, 164, 247, 477, 630, 1378, 1590, 3957, 3963, 11300, 9728, 32104, 23425, 90771, 55006, 255478, 124758, 715923, 268757, 1997808, 531552, 5552220, 884695, 15368813, 834686, 42373618, 2113458, 116369557, 17926357
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OFFSET

0,2


COMMENTS

Row sums of number triangle A119305.


LINKS

Table of n, a(n) for n=0..36.
Index entries for linear recurrences with constant coefficients, signature (1,3,3,1).


FORMULA

G.f.: (14x)/(1x+3x^23x^3+x^4); a(n)=a(n1)3a(n2)+3a(n3)a(n4); a(n)=sum{k=0..n, (C(3k,nk)+4*C(3k,nk1))(1)^(nk)}.


CROSSREFS

Sequence in context: A202931 A240250 A239424 * A107972 A238775 A036252
Adjacent sequences: A119303 A119304 A119305 * A119307 A119308 A119309


KEYWORD

easy,sign


AUTHOR

Paul Barry, May 13 2006


STATUS

approved



