%I #4 Mar 31 2012 12:35:07
%S 1,3,8,17,36,71,144,289,594,1231,2602,5573,12128,26727,59668,134729,
%T 307618,709503,1652402,3883445,9206712
%N Half the number of n X n symmetric binary matrices with adjacent rows differing in at most one position.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jun 15 2008
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