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%I #3 Jun 17 2023 08:03:13
%S 2,2,22,98,502,2498,12502,62498,312502,1562498,7812502,39062498,
%T 195312502,976562498,4882812502,24414062498,122070312502,610351562498,
%U 3051757812502,15258789062498,76293945312502,381469726562498
%N First differences of A087404: a(n)=A087404(n)-A087404(n-1), a(0)=A087404(0).
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4, 5).
%F G.f.: ((1-x)(2-4x))/(1-4x-5x^2). For n>0: a(n)=4*5^(n-1)+2(-1)^n
%t CoefficientList[Series[((1 - x)(2 - 4x))/(1 - 4x - 5x^2), {x, 0, 25}], x]
%K easy,nonn
%O 0,1
%A Mario Catalani (mario.catalani(AT)unito.it), Sep 01 2003
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