A250326 Number of length 7+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

212, 5849, 61092, 363457, 1559080, 5237161, 14866258, 37065983, 83449226, 172987415

Offset

1,1

Comments

Row 7 of A250320

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A082828 A254704 A267062 * A344423 A238023 A204299

Adjacent sequences: A250323 A250324 A250325 * A250327 A250328 A250329

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved