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

1,1

Comments

Column 2 of A265928.

Links

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

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)

Example

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

Crossrefs

Cf. A265928.

Sequence in context: A199657 A094730 A265930 * A136736 A119785 A067457

Adjacent sequences: A265919 A265920 A265921 * A265923 A265924 A265925

Keyword

nonn

Author

R. H. Hardin, Dec 18 2015

Status

approved