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

1,1

Comments

Row 2 of A265928.

Links

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

R. H. Hardin, Empirical recurrence of order 55

Formula

Empirical recurrence of order 55 (see link above)

Example

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

Crossrefs

Cf. A265928.

Sequence in context: A344656 A199657 A094730 * A265922 A136736 A119785

Adjacent sequences: A265927 A265928 A265929 * A265931 A265932 A265933

Keyword

nonn

Author

R. H. Hardin, Dec 18 2015

Status

approved