A224348 Number of nX3 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.

10, 100, 788, 5880, 45064, 349280, 2710892, 21021916, 163012744, 1264202660, 9804721360, 76042111360, 589756075600, 4573942739248, 35473931052816, 275123688202096, 2133765358334352, 16548755248130912, 128346493442546640

Offset: 1

Author

R. H. Hardin Apr 04 2013

Keywords

• nonn

Comments

Column 3 of A224353

Examples

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

Links

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

Formula

Empirical: a(n) = 10*a(n-1) -16*a(n-2) -24*a(n-3) +164*a(n-4) -516*a(n-5) +140*a(n-6) +956*a(n-7) -1500*a(n-8) +3180*a(n-9) +60*a(n-10)