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A190422 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically, antidiagonally or horizontally 0

%I

%S 34,254,3444,76352,2733816,163925231,16307921090,2666369228454,

%T 724501421348158,326444188458835963,242909750685458209759,

%U 299419887986747081985221,611366002048450741040107233

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

%e Some solutions for n=2

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ May 10 2011

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Last modified October 3 10:58 EDT 2022. Contains 357231 sequences. (Running on oeis4.)