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A145793 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only either four adjacent vertically or four adjacent horizontally. 0

%I

%S 1,1,1,1,1,2,3,5,8,17,40,108,294,944,3040,12114,49757,243775,1210271,

%T 7153531,43484383,316861269,2366046579,21108349931,192219307524,

%U 2092034177623,23326966046445,311290850669433,4251413939111348

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only either four adjacent vertically or four adjacent horizontally.

%K nonn

%O 1,6

%A _R. H. Hardin_, Oct 19 2008

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Last modified August 18 13:12 EDT 2019. Contains 326100 sequences. (Running on oeis4.)