A250559 Number of length n+2 0..6 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero

25, 321, 3125, 31173, 290909, 2457921, 18934449, 137976845, 980389815, 6899647449, 48392977271, 339018816865, 2373951608191, 16620410187793, 116352541474531

Offset

1,1

Comments

Column 6 of A250561

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=4
..6....5....0....5....6....6....2....3....4....3....4....6....2....6....1....4
..0....6....2....1....4....4....3....1....2....2....6....4....3....4....3....4
..0....6....6....4....0....6....5....1....3....1....0....3....3....1....4....5
..4....1....4....1....0....5....3....4....0....1....6....5....4....1....0....2
..3....1....6....1....4....1....6....6....4....5....1....2....2....6....4....4
..5....2....4....3....6....1....1....4....2....6....3....6....5....4....6....6

Crossrefs

Sequence in context: A228255 A125437 A250318 * A244446 A246625 A161525

Adjacent sequences: A250556 A250557 A250558 * A250560 A250561 A250562

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved