Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions.

A140179

Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions.

Terms

    a(0) =1a(1) =4a(2) =32a(3) =512a(4) =14513a(5) =603485a(6) =29856303a(7) =1487335683a(8) =68719476736

External references