%I A125905
%S A125905 1,4,15,56,209,780,2911,10864,40545,151316,564719,2107560,7865521,
%T A125905 29354524,109552575,408855776,1525870529,5694626340,21252634831,
%U A125905 79315912984,296011017105,1104728155436,4122901804639,15386878263120
%V A125905 1,-4,15,-56,209,-780,2911,-10864,40545,-151316,564719,-2107560,7865521,
               -29354524,
%W A125905 109552575,-408855776,1525870529,-5694626340,21252634831,-79315912984,
               296011017105,
%X A125905 -1104728155436,4122901804639,-15386878263120
%N A125905 a(0)=1, a(1)=-4, a(n)=-4*a(n-1)-a(n-2) for n>1.
%F A125905 G.f.: 1/(1+4*x+x^2)
%Y A125905 Cf. A001353, A106707.
%Y A125905 Sequence in context: A010905 A001353 A106707 this_sequence A026030 A047038 
               A158500
%Y A125905 Adjacent sequences: A125902 A125903 A125904 this_sequence A125906 A125907 
               A125908
%K A125905 easy,sign
%O A125905 0,2
%A A125905 Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 04 2007