%I A087433
%S A087433 1,2,6,20,70,252,926,3460,13110,50252,194446,758100,2973350,11716252,
%T A087433 46333566,183739940,730176790,2906358252,11582386286,46200404980,
%U A087433 184414199430,736494536252,2942491360606,11759505089220,47006639297270
%N A087433 Expansion of (1-2*x)*(1-4*x+x^2)/((1-x)*(1-3*x)*(1-4*x)).
%C A087433 Binomial transform of A087432. a(n+1)=2*A085282(n).
%C A087433 Counts closed walks of length 2n at a vertex of the cyclic graph on 12 
               nodes C_12. - Herbert Kociemba (kociemba(AT)t-online.de), Jun 06 
               2004
%F A087433 a(n)=0^n/6+1/3+3^n/3+4^n/6
%Y A087433 Sequence in context: A065346 A071976 A000984 this_sequence A119373 A151284 
               A049138
%Y A087433 Adjacent sequences: A087430 A087431 A087432 this_sequence A087434 A087435 
               A087436
%K A087433 easy,nonn
%O A087433 0,2
%A A087433 Paul Barry (pbarry(AT)wit.ie), Sep 02 2003
%E A087433 Definition corrected by Herbert Kociemba (kociemba(AT)t-online.de), Jun 
               06 2004.