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

Author

R. H. Hardin, Dec 19 2015

Keywords

• nonn

Comments

Column 4 of A265973.

Examples

			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
		

Links

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

Crossrefs

Cf. A265973.