A145964 - OEIS

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,25,173,1794,20685,319727,6676539,232552310,11372993795

%N Number of n X n binary arrays with all ones connected only in a one by five or five by one block.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.1.1

%e .1.0.1.0.0.0.0.0

%e .1.0.1.0.0.1.0.0

%e .1.0.1.0.0.1.0.1

%e .1.0.1.0.0.1.0.1

%e .1.0.1.0.0.1.0.1

%e .0.0.0.0.0.1.0.1

%e .1.1.1.1.1.0.0.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 25 2008