A211692 Number of -4..4 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, three or four distinct values for every i<=n and j<=n

69, 533, 4033, 30177, 223197, 1634877, 11870705, 85525665, 611921697, 4350979769, 30763863645, 216419598445, 1515531563165, 10568991793581, 73429250621533, 508417994900109, 3509319518941045, 24154369305654701, 165824297901834385

Offset

1,1

Links

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

Example

Some solutions for n=5
.-2...-3...-3...-4...-2...-2...-4....0...-2...-2...-4...-3...-4...-4...-1...-4
..4....2...-1....0....1...-3....4...-4....4....1....4....3...-3....3...-3....3
.-1....3...-4...-1...-2...-1....2....0....0....2....2...-2....2....4....4...-3
..0...-2....3...-2...-4....2...-3...-4...-4....3...-2...-1....0...-3...-2...-4
..0...-3....2....4....0...-3....3...-2...-3....4....1...-4...-4....4....0...-3
..3....2...-4...-4...-4....0...-3....3....2...-4....0...-3....4...-3....3....4

Crossrefs

Sequence in context: A234825 A251010 A251003 * A264288 A360359 A113707

Adjacent sequences: A211689 A211690 A211691 * A211693 A211694 A211695

Keyword

nonn

Author

R. H. Hardin Apr 18 2012

Status

approved