A265930 Number of 2Xn 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.

25, 340, 1740, 9016, 44916, 223788, 1119424, 5621396, 28130560, 140718764, 704493864, 3528165236, 17658676752, 88394841700, 442557740144, 2215472575772, 11090095537400, 55519269652292, 277940545496176, 1391364670745476

Offset: 1

Author

R. H. Hardin, Dec 18 2015

Keywords

• nonn

Comments

Row 2 of A265928.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 55

Crossrefs

Cf. A265928.

Formula

Empirical recurrence of order 55 (see link above)