A250566 Number of length 7+2 0..n arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero

254, 9611, 127586, 937817, 4808120, 18934449, 62245658, 176612641, 448770968, 1038399963, 2233005894

Offset

1,1

Comments

Row 7 of A250561

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A255178 A196738 A195859 * A278155 A251860 A145715

Adjacent sequences: A250563 A250564 A250565 * A250567 A250568 A250569

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved