A200460 Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero first and second differences

22, 5478, 103726, 820650, 4062384, 14923636, 44716536, 115516220, 266427776, 562116652, 1103746930, 2042412926, 3596047852, 6069519806, 9877920686, 15574753386, 23883962076, 35735712652, 52308828350, 75077488038

Offset

1,1

Comments

Row 6 of A200454

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

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

Crossrefs

Sequence in context: A218719 A109776 A110802 * A202054 A279298 A235389

Adjacent sequences: A200457 A200458 A200459 * A200461 A200462 A200463

Keyword

nonn

Author

R. H. Hardin Nov 18 2011

Status

approved