A265969 Number of nX4 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique.

340, 7656, 23920, 74248, 230784, 721864, 2263704, 7152956, 22522200, 71566116, 226074624, 720236752, 2280992736, 7276115664, 23077516368, 73669330232, 233938714232, 747052012824, 2374072906440, 7582196847884, 24110436293280

Offset

1,1

Comments

Column 4 of A265973.

Links

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

Example

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

Crossrefs

Cf. A265973.

Sequence in context: A237959 A232514 A187383 * A265924 A239159 A222927

Adjacent sequences: A265966 A265967 A265968 * A265970 A265971 A265972

Keyword

nonn

Author

R. H. Hardin, Dec 19 2015

Status

approved