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Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.
0

%I #5 Sep 04 2022 22:34:16

%S 0,4367,8399702,12350550690,16858052804062,22467362744958042

%N Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

%C Column 7 of A217346.

%e Some solutions for n=3

%e ..0..1..0..2..1..1..1....0..1..0..1..1..2..1....0..1..0..1..1..1..1

%e ..0..2..2..2..1..0..2....0..1..3..3..1..0..1....0..2..1..1..2..2..2

%e ..1..2..1..0..2..0..0....1..1..1..1..2..0..0....1..1..0..1..1..1..1

%Y Cf. A217346.

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 01 2012