A238319 Number of (n+1) X (4+1) 0..2 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.

51, 1867, 41046, 721939, 13265123, 261676376, 5206684654, 102053610873, 1987295524193, 38770223731701, 758012281434166, 14822685184195262, 289709710098420174, 5661329642092072222, 110637907561833470425

Offset: 1

Author

R. H. Hardin, Feb 24 2014

Keywords

• nonn

Comments

Column 4 of A238323.

Examples

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

Links

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

Crossrefs

Cf. A238323.