%I A109164
%S A109164 1,6,20,57,154,408,1073,2814,7372,19305,50546,132336,346465,907062,
%T A109164 2374724,6217113,16276618,42612744,111561617,292072110,764654716,
%U A109164 2001892041,5241021410,13721172192,35922495169,94046313318,246216444788
%N A109164 a(n) = 4*a(n-1) - 4*a(n-2) + a(n-3), n >= 3.
%F A109164 a(n) - a(n-1) = A054486(n+1); G.f. (2*x+1)/((1-x)*(x^2-3*x+1))
%o A109164 Floretion Algebra Multiplication Program, FAMP Code: 4tessumseq[ + .25'i 
               + .25i' + .25'ii' + .25'jj' + .25'kk' + .25'jk' + .25'kj' + .25e], 
               sumtype: (Y[15], *, vesy)
%Y A109164 Cf. A054486.
%Y A109164 Sequence in context: A048778 A048611 A127982 this_sequence A027984 A018808 
               A027107
%Y A109164 Adjacent sequences: A109161 A109162 A109163 this_sequence A109165 A109166 
               A109167
%K A109164 easy,nonn
%O A109164 0,2
%A A109164 Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 18 2005