A250318 Number of length n+2 0..6 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

25, 321, 745, 7969, 57305, 558541, 5237161, 50020061, 461868677, 4110975765

Offset

1,1

Comments

Column 6 of A250320

Links

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

Example

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

Crossrefs

Sequence in context: A240846 A228255 A125437 * A250559 A244446 A246625

Adjacent sequences: A250315 A250316 A250317 * A250319 A250320 A250321

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved