A224200 Number of nX4 0..3 arrays with rows unimodal and antidiagonals nondecreasing.

130, 4580, 108625, 2411246, 54177872, 1229044416, 27957232796, 636184842092, 14476260508500, 329391607167600, 7494853316529036, 170534677669656388, 3880272541450452972, 88290059453259690888, 2008914306032132754800

Offset: 1

Author

R. H. Hardin Apr 01 2013

Keywords

• nonn

Comments

Column 4 of A224204

Examples

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

Links

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

Formula

Empirical: a(n) = 35*a(n-1) -347*a(n-2) +1689*a(n-3) -2986*a(n-4) -2311*a(n-5) +23532*a(n-6) -23864*a(n-7) -36468*a(n-8) +100464*a(n-9) +94080*a(n-10) for n>12