A224034 Number of nX4 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

5, 19, 58, 168, 488, 1422, 4160, 12214, 35960, 106072, 313246, 925694, 2736638, 8092056, 23930330, 70772252, 209309684, 619043562, 1830861726, 5414905178, 16014983408, 47365507554, 140087012360, 414317718488, 1225375238694

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Column 4 of A224038

Examples

			Some solutions for n=3
..1..1..1..1....0..0..1..1....0..0..0..0....0..0..0..1....0..0..0..0
..1..1..1..1....0..1..1..1....1..1..1..1....0..0..0..1....0..1..1..1
..0..1..1..1....0..1..1..1....1..1..1..1....0..0..0..0....0..0..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 5*a(n-1) -6*a(n-2) -a(n-3) +2*a(n-4) +2*a(n-5) -2*a(n-6) +4*a(n-7)