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A202639 Number of (n+2) X (n+2) binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals. 0

%I #7 Jan 01 2024 19:49:48

%S 66,530,7432,171362,6324344,386981422,38841628112,6372413856774,

%T 1725107798449008,768319633522920162

%N Number of (n+2) X (n+2) binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals.

%C Diagonal of A202647.

%e Some solutions for n=3

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

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

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

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

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

%Y Cf. A202647.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 22 2011

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Last modified July 21 13:28 EDT 2024. Contains 374474 sequences. (Running on oeis4.)