A250315 Number of length n+2 0..3 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

8, 60, 104, 652, 2432, 12820, 61092, 300616, 1423966, 6523576, 28749998, 122577404, 509838050, 2086581780, 8455716678, 34069235524

Offset

1,1

Comments

Column 3 of A250320

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A285231 A264817 A032365 * A074423 A199906 A297690

Adjacent sequences: A250312 A250313 A250314 * A250316 A250317 A250318

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved