%I A104187
%S A104187 1,3,8,18,38,76,147,279,523,973,1802,3328,6136,11302,20805,38285,70437,
%T A104187 129575,238348,438414,806394,1483216,2728087,5017763,9229135,16975057,
%U A104187 31222030
%N A104187 G.f. (1+x^2+x^4)/((x^3+x^2+x-1)(x-1)^2).
%C A104187 A floretion-generated sequence involving Tribonacci numbers.
%F A104187 a(n+2) - 2*a(n+1) + a(n) = A081172(n+4)
%F A104187 a(n) = (1/2) [A000073(n+3) + A000073(n+6) - 3n - 6 ]. - Ralf Stephan, 
               May 20 2007
%o A104187 Floretion Algebra Multiplication Program, FAMP Code: 1tesforrokseq[A*B] 
               = A = - .5'ii' + .5'jj' + .5'kk' + .5e B = + 'kj', 1vesforrokseq[A*B] 
               = A000004, ForType: 1A.
%Y A104187 Cf. A081172.
%Y A104187 Sequence in context: A036642 A000235 A006478 this_sequence A051633 A131051 
               A117727
%Y A104187 Adjacent sequences: A104184 A104185 A104186 this_sequence A104188 A104189 
               A104190
%K A104187 nonn
%O A104187 0,2
%A A104187 Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Apr 01 2005