%I A087432
%S A087432 1,1,3,7,19,51,143,407,1179,3451,10183,30207,89939,268451,802623,
%T A087432 2402407,7196299,21567051,64657463,193885007,581480259,1744091251,
%U A087432 5231574703,15693326007,47077181819,141225953051,423666674343
%N A087432 Expansion of (1-3x+2x^2)/((1+x)(1-2x)(1-3x)).
%C A087432 Binomial transform of A047849 (with interpolated zeros). Binomial transform 
               is A087433.
%F A087432 a(n)=(-1)^n/6+0^n/3+2^n/3+3^n/6
%F A087432 For n>4, a(n) = 6*a(n-1) - 9*a(n-2) - 4*a(n-3) + 12*a(n-4). E.g. a(7) 
               = 407 = 6*143 - 9*51 - 4*19 + 12* 7. - Gary W. Adamson (qntmpkt(AT)yahoo.com), 
               Jun 14 2006
%Y A087432 First differences of A093379.
%Y A087432 Sequence in context: A026325 A002426 A011769 this_sequence A135052 A146597 
               A115254
%Y A087432 Adjacent sequences: A087429 A087430 A087431 this_sequence A087433 A087434 
               A087435
%K A087432 nonn
%O A087432 0,3
%A A087432 Paul Barry (pbarry(AT)wit.ie), Sep 02 2003