%I #8 Jun 13 2015 00:51:08
%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