A223796 Number of nX3 0..3 arrays with rows and antidiagonals unimodal.

50, 2500, 110116, 4816168, 210163664, 9169032476, 400006582368, 17450517286804, 761287955888788, 33211580867804324, 1448872354425344280, 63207803924281966208, 2757473052802943936172, 120296184397162010680224

Offset: 1

Author

R. H. Hardin Mar 27 2013

Keywords

• nonn

Comments

Column 3 of A223801

Examples

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

Links

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

Formula

Empirical: a(n) = 50*a(n-1) -253*a(n-2) -1283*a(n-3) +8456*a(n-4) -10020*a(n-5) -12064*a(n-6) +27360*a(n-7) -6656*a(n-8) -9728*a(n-9) +4096*a(n-10)