%I A087946
%S A087946 1,3,10,35,126,461,1702,6315,23494,87533,326382,1217483,4542526,
%T A087946 16950573,63255670,236063915,880983606,3287837741,12270301822,
%U A087946 45793238475,170902389934,637815796973,2380359749382,8883621103403
%N A087946 Expansion of (1-3x+x^2)/((1-2x)(1-4x+x^2)).
%C A087946 Binomial transform of A057960. a(n)=A087944(n+1)/2.
%F A087946 a(0)=1, a(3)=4, a(2)=10, a(n)=6a(n-1)-9a(n-2)+2a(n-3), n>2; a(n)=2^n/
               3+(2+sqrt(3))(2+sqrt(3))^n/6+(2-sqrt(3))(2-sqrt(3))^n/6.
%Y A087946 Sequence in context: A026026 A047037 A134391 this_sequence A122068 A099908 
               A167403
%Y A087946 Adjacent sequences: A087943 A087944 A087945 this_sequence A087947 A087948 
               A087949
%K A087946 easy,nonn
%O A087946 0,2
%A A087946 Paul Barry (pbarry(AT)wit.ie), Sep 16 2003