A238283 Number of (n+1) X (3+1) 0..3 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.

50, 1844, 42084, 737366, 12926271, 245920800, 4810332239, 92790334588, 1767175335274, 33631393265283, 642245437813719, 12282485000914102, 234784249649799771, 4485361687341554225, 85682498512887615932

Offset: 1

Author

R. H. Hardin, Feb 22 2014

Keywords

• nonn

Comments

Column 3 of A238287.

Examples

			Some solutions for n=3
..1..2..2..2....2..3..3..1....0..1..1..0....0..1..2..2....3..3..3..3
..0..1..2..2....1..2..2..0....0..1..1..0....0..1..2..2....1..1..1..1
..0..1..2..2....0..2..2..0....1..3..3..0....3..3..2..2....1..1..1..0
..1..1..3..3....0..3..3..1....1..3..3..0....3..3..2..2....1..1..1..0
		

Links

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

Crossrefs

Cf. A238287.