A250276 Number of length n+1 0..7 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero

8, 88, 288, 3156, 25964, 281552, 2908232, 30143732, 301550620, 2901853512, 26702134812, 235590646376

Offset

1,1

Comments

Column 7 of A250277

Links

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

Example

Some solutions for n=5
..6....5....7....7....0....3....2....5....0....7....0....1....5....6....6....6
..4....4....1....0....5....7....3....2....2....3....0....5....2....7....3....4
..6....1....6....0....3....2....5....2....1....6....6....1....6....7....7....0
..7....1....6....7....1....4....5....5....1....4....0....3....1....4....3....3
..4....4....1....6....0....5....3....2....2....3....3....5....5....1....3....2
..4....5....7....5....4....7....4....5....4....1....6....5....1....2....6....4

Crossrefs

Sequence in context: A035133 A045643 A250228 * A298191 A299085 A299341

Adjacent sequences: A250273 A250274 A250275 * A250277 A250278 A250279

Keyword

nonn

Author

R. H. Hardin, Nov 16 2014

Status

approved