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A190534 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 vertically, antidiagonally or horizontally 1

%I

%S 42,282,2156,22640,316238,6107152,160575506,5870861789,297355717075,

%T 20939485177609,2053441860491509,280623087234506165,

%U 53465534329788380473,14206838360639441172569,5266500605033810191697624

%N Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 vertically, antidiagonally or horizontally

%H R. H. Hardin, <a href="/A190534/b190534.txt">Table of n, a(n) for n = 1..30</a>

%e Some solutions for 4X4

%e ..0..0..0..0....1..0..0..1....1..1..1..1....0..1..0..0....0..1..0..1

%e ..0..1..0..1....0..0..0..1....1..1..1..0....1..0..0..0....1..0..0..0

%e ..0..0..1..0....0..0..1..0....1..1..0..0....0..0..0..1....0..0..0..0

%e ..0..1..0..1....1..1..0..0....1..0..0..1....0..0..1..0....1..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ May 12 2011

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Last modified May 27 03:13 EDT 2022. Contains 354093 sequences. (Running on oeis4.)