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A228476 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally. 6

%I #9 Dec 18 2015 18:18:38

%S 1,2,14,172,4354,211588,20185842,3737615288,1349721589622,

%T 948593164919044,1298594593323021084,3461591189556243601228,

%U 17969903126848842785918376,181660279488635404176787338286

%N Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally.

%C Diagonal of A228482

%H R. H. Hardin, <a href="/A228476/b228476.txt">Table of n, a(n) for n = 1..27</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Aug 22 2013

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)