Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #4 Jul 14 2015 07:49:55
%S 48,214,1680,7725,25444,251582,1838884,7478945,76589120,1223125268,
%T 8125786040,53795046102,1356397478832,26105639799058,186181935816048,
%U 2661981784951575
%N Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111
%C Diagonal of A260070
%e Some solutions for n=4
%e ..1..1..0..0..0..0....0..0..0..0..0..0....0..1..0..0..0..1....1..0..0..0..0..0
%e ..0..0..0..0..1..1....1..0..0..0..1..0....0..0..0..0..1..0....1..0..0..1..1..0
%e ..0..0..0..0..1..1....1..1..0..0..1..0....0..0..0..0..0..0....0..0..0..1..1..0
%e ..1..1..0..0..0..0....0..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0
%e ..0..0..0..0..0..0....0..0..0..0..0..0....0..1..0..0..1..0....1..0..0..0..0..0
%e ..0..0..0..0..1..0....1..1..0..0..1..1....0..0..0..0..1..1....1..0..0..1..1..0
%Y Cf. A260070
%K nonn
%O 1,1
%A _R. H. Hardin_, Jul 14 2015