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A265930 Number of 2Xn 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique. 1
25, 340, 1740, 9016, 44916, 223788, 1119424, 5621396, 28130560, 140718764, 704493864, 3528165236, 17658676752, 88394841700, 442557740144, 2215472575772, 11090095537400, 55519269652292, 277940545496176, 1391364670745476 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 22 06:54 EDT 2022. Contains 353933 sequences. (Running on oeis4.)