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A183323 Number of n X n binary arrays with each 1 adjacent to exactly two other 1s 0

%I

%S 1,2,6,27,289,4740,128371,6115158,505971397,73890230419,

%T 19136191954838,8704355999401819,6908686513461201175,

%U 9552034660752931158279

%N Number of n X n binary arrays with each 1 adjacent to exactly two other 1s

%C Diagonal of A183328

%e Some solutions for 6X6

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 03 2011

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Last modified October 1 07:28 EDT 2022. Contains 357135 sequences. (Running on oeis4.)