A224277 Number of nX4 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

130, 4580, 84132, 1334973, 21348990, 356222482, 6172817040, 109166159263, 1947747629183, 34864494529806, 624634228911233, 11192898789327524, 200562963738597382, 3593689853465024489, 64389966977277732381

Offset: 1

Author

R. H. Hardin Apr 02 2013

Keywords

• nonn

Comments

Column 4 of A224281

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 52

Formula

Empirical recurrence of order 52 (see link above)