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A087448 3^(n-1)(n+3)/2-(n-1)/2. 1

%I

%S 1,2,7,26,93,322,1091,3642,12025,39362,127935,413338,1328597,4251522,

%T 13551739,43046714,136314609,430467202,1355971703,4261625370,

%U 13366006861,41841412802,130754415027,407953774906,1270932914153

%N 3^(n-1)(n+3)/2-(n-1)/2.

%C Binomial transform of A087447. Second binomial transform of 1,0,3,0,5,0,7,... (A005408).

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (8,-22,24,-9).

%F G.f.: (1-2*x)*(1-4*x+5*x^2)/((1-x)^2*(1-3*x)^2). [_Colin Barker_, Mar 18 2012]

%K easy,nonn

%O 0,2

%A _Paul Barry_, Sep 05 2003

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)