A265922 Number of nX2 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.

25, 340, 4616, 62696, 851496, 11564952, 157071768, 2133318088, 28974227016, 393521606584, 5344722135352, 72590826767208, 985912408928360, 13390442524046040, 181866003973693912, 2470063509346243592

Offset: 1

Author

R. H. Hardin, Dec 18 2015

Keywords

• nonn

Comments

Column 2 of A265928.

Examples

			Some solutions for n=4
..3..4....2..4....1..3....2..0....2..1....0..2....0..3....4..4....1..1....2..2
..1..0....3..3....2..4....1..1....3..0....1..4....4..0....2..2....2..0....3..1
..3..2....1..1....3..1....3..2....1..3....3..1....2..2....4..4....0..2....2..0
..4..1....2..4....0..0....4..0....4..0....0..4....4..3....3..1....1..1....0..1
		

Links

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

Crossrefs

Cf. A265928.

Formula

Empirical: a(n) = 5*a(n-1) +110*a(n-2) +186*a(n-3) -1189*a(n-4) -2127*a(n-5) +4920*a(n-6) +5776*a(n-7) -9216*a(n-8)