%I A111570
%S A111570 2,5,4,7,14,23,34,55,92,149,238,385,626,1013,1636,2647,4286,6935,11218,
%T A111570 18151,29372,47525,76894,124417,201314,325733,527044,852775,1379822,
%U A111570 2232599,3612418,5845015,9457436,15302453,24759886
%N A111570 a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4.
%C A111570 See comment and FAMP code for A111569.
%F A111570 G.f. (-2-3*x+x^2-x^3)/((1+x^2)*(x^2+x-1))
%o A111570 Floretion Algebra Multiplication Program, FAMP Code: 1vesseq[B+H] with 
               B = - .25'i + .25'j - .25i' + .25j' + k' - .5'kk' - .25'ik' - .25'jk' 
               - .25'ki' - .25'kj' - .5e and H = + .75'ii' + .75'jj' + .75'kk' + 
               .75e
%Y A111570 Cf. A001638, A111569, A111571, A111572, A111573, A007598, A000045.
%Y A111570 Sequence in context: A036237 A015948 A119733 this_sequence A057954 A155896 
               A060710
%Y A111570 Adjacent sequences: A111567 A111568 A111569 this_sequence A111571 A111572 
               A111573
%K A111570 easy,nonn
%O A111570 0,1
%A A111570 Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 10 2005