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%I #22 May 05 2019 03:49:03
%S 1,3,27,59,443,955,7099,15291,113595,244667,1817531,3914683,29080507,
%T 62634939,465288123,1002159035,7444609979,16034544571,119113759675,
%U 256552713147,1905820154811,4104843410363,30493122476987,65677494565819
%N a(n) = (10*4^n - 3*(-4)^n - 22)/30.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1,16,-16).
%F G.f.: x*(1+2*x+8*x^2) / ( (x-1)*(4*x-1)*(4*x+1) ). - _R. J. Mathar_, Apr 30 2010
%p seq( (10*4^n-3*(-4)^n-22)/30, n=1..10) ; # _R. J. Mathar_, Oct 11 2011
%K nonn,easy
%O 1,2
%A _Roger L. Bagula_, Apr 29 2010
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