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%I #11 Jun 13 2015 00:49:19
%S 1,4,9,50,105,616,1287,7601,15873,93819,195910,1158052,2418195,
%T 14294449,29849041,176444054,368442700,2177943781,4547886208,
%U 26883530748,56137003923,331837870408,692929213991,4096053203771,8553197751125
%N Second line of 5-wave sequence A038201.
%H F. v. Lamoen, <a href="http://home.wxs.nl/~lamoen/wiskunde/wave.htm">Wave sequences</a>
%H <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (0,15,0,-35,0,28,0,-9,0,1).
%F G.f.: (x^7+x^6-6*x^5-5*x^4+10*x^3+6*x^2-4*x-1) / (x^10-9*x^8+28*x^6-35*x^4+15*x^2-1). - _Alois P. Heinz_, Jul 16 2009
%p a:= n-> (Matrix([`if`(irem(n,2)=0, [9, 1, 0, -1, -4], [4, 0, -1, -3, -9])]). Matrix(5, (i,j)-> if i=j-1 then 1 elif j=1 then [15, -35, 28, -9, 1][i] else 0 fi)^iquo(n+1, 2))[1,2]: seq(a(n), n=0..24); # _Alois P. Heinz_, Jul 16 2009
%K nonn,easy
%O 0,2
%A _Floor van Lamoen_
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