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A201346 Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0

%I

%S 0,4,18,191,4860,310036,53350918,26097731070,37211940860240,

%T 157260419809121989

%N Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

%C Diagonal of A201353

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 30 2011

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)