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Number of 4Xn arrays containing n copies of 0..4-1 avoiding the pattern down-up in every row and equal-up in every column.
0

%I #5 Aug 12 2016 06:54:17

%S 24,1880,68876,2316638,94747953,4581555620,234861499280,

%T 12266888439720,650084333233220

%N Number of 4Xn arrays containing n copies of 0..4-1 avoiding the pattern down-up in every row and equal-up in every column.

%C Row 4 of A269646.

%e Some solutions for n=3

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

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

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

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

%Y Cf. A269646.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 02 2016