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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2015
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)