A250319 Number of length n+2 0..7 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

32, 480, 1152, 14452, 119004, 1357424, 14866258, 166783380, 1809575752

Offset

1,1

Comments

Column 7 of A250320

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A284339 A125467 A282525 * A000152 A319307 A022069

Adjacent sequences: A250316 A250317 A250318 * A250320 A250321 A250322

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved