Search: id:A155119
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%I A155119
%S A155119 1,4,24,140,820,4800,28100,164500,963000,5637500,33002500,193200000,
%T A155119 1131012500,6621062500,38760375000,226907187500,1328337812500,
%U A155119 7776225000000,45522814062500,266495195312500,1540090046875000
%N A155119 a(n)=5*a(n-1)+5*a(n-2), n>2 ; a(0)=1, a(1)=4, a(2)=24 .
%F A155119 G.f.: (1-x-x^2)/(1-5*x-5*x^2) .
%F A155119 a(n)=(14/15)*sqrt(5)*{[(5/2)+(3/2)*sqrt(5)]^(n-1)-[(5/2)-(3/2)*sqrt(5)]^(n-1)}+2*{[(5/
               2)+(3/2)*sqrt(5)]^(n-1)+[(5/2)-(3/2)*sqrt(5)]^(n-1)}+(1/5)*[C(2*n,
               n) mod 2], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 26 
               2009]
%Y A155119 Sequence in context: A153337 A122690 A005319 this_sequence A114169 A121102 
               A067411
%Y A155119 Adjacent sequences: A155116 A155117 A155118 this_sequence A155120 A155121 
               A155122
%K A155119 nonn
%O A155119 0,2
%A A155119 Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jan 20 2009

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