A200459 Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero first and second differences

14, 1582, 19802, 115140, 451708, 1375006, 3513884, 7910100, 16176994, 30639164, 54582252, 92444962, 150029642, 234839570, 356372880, 526276044, 758938962, 1071722528, 1485196016, 2023848468, 2716453852, 3596089776, 4701336350

Offset

1,1

Comments

Row 5 of A200454

Links

R. H. Hardin, Table of n, a(n) for n = 1..96

Example

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

Crossrefs

Sequence in context: A160246 A145693 A279326 * A164524 A322848 A206644

Adjacent sequences: A200456 A200457 A200458 * A200460 A200461 A200462

Keyword

nonn

Author

R. H. Hardin Nov 18 2011

Status

approved