A223878 Number of 4Xn 0..3 arrays with rows, diagonals and antidiagonals unimodal.

256, 65536, 3863372, 88682677, 1271992512, 13394424591, 112751480926, 798519332969, 4918189868664, 26945689043408, 133456233695247, 604775893442790, 2531399109074463, 9862376758221364, 35997221510544568

Offset: 1

Author

R. H. Hardin Mar 28 2013

Keywords

• nonn

Comments

Row 4 of A223876

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..177
• R. H. Hardin, Empirical polynomial of degree 24

Formula

Empirical polynomial of degree 24 (see link above)