A250325 Number of length 6+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero.

104, 1689, 12820, 57833, 197848, 558541, 1357424, 2953265, 5883028, 10994585, 19364348, 32540881

Offset

1,1

Comments

Row 6 of A250320

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A200196 A234219 A223420 * A244946 A186931 A273224

Adjacent sequences: A250322 A250323 A250324 * A250326 A250327 A250328

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved