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Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.
0

%I #5 Sep 03 2022 20:30:04

%S 15,867,43941,1941904,76453838,2740448352,91020540767,2837847226191,

%T 83919692408722,2372632276864454,64552746518391559,

%U 1698928155067259979,43440043738459660061,1082941619670703392975

%N Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.

%C Row 4 of A223815.

%e Some solutions for n=3

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

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

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

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

%Y Cf. A223815.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 27 2013