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 A183717 1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease. 1

%I

%S 408,5776,71712,954496,12606120,168070828,2239265280,29887741084,

%T 398877017736,5325395568832,71097798240000,949288848361824,

%U 12674717188992600,169233802374938432,2259618796412155200

%N 1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

%C Column 7 of A183719.

%H R. H. Hardin, <a href="/A183717/b183717.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 3 X 8:

%e ..0..4..0..4..0..4..0..4....1..0..2..0..1..0..1..0....3..0..3..0..4..0..4..0

%e ..2..3..1..2..1..2..1..2....3..4..3..4..2..4..2..3....2..1..2..1..3..1..3..2

%e ..0..4..0..4..0..3..0..3....2..0..1..0..1..0..1..0....3..4..3..0..4..0..4..1

%e ...

%e ...L..R..L..R..L..R..L.......L..R..L..R..L..R..L.......R..L..R..L..R..L..R...

%e ...R..L..R..L..R..L..R.......R..L..R..L..R..L..R.......L..R..L..R..L..R..L...

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 06 2011

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Last modified August 11 10:15 EDT 2022. Contains 356065 sequences. (Running on oeis4.)