Search: id:A129884
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%I A129884
%S A129884 1,1,4,4,16,17,72,79
%N A129884 Sequence a_{s_n} arising in enumeration of arrays of directed blocks 
               (see Quaintance reference for precise definition), where a_n = A129878, 
               s_n = A129873.
%D A129884 Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper 
               Arrays, Discrete Math., 307 (2007), 1844-1864.
%F A129884 See Quaintance reference for generating functions that produce A129872-A129886.
%Y A129884 Sequence in context: A141125 A164111 A164906 this_sequence A137725 A082649 
               A156232
%Y A129884 Adjacent sequences: A129881 A129882 A129883 this_sequence A129885 A129886 
               A129887
%K A129884 nonn
%O A129884 1,3
%A A129884 N. J. A. Sloane (njas(AT)research.att.com), May 26 2007

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