A250316 Number of length n+2 0..4 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

13, 117, 233, 1773, 8767, 57833, 363457, 2317841, 14305925, 85334033, 487200669, 2669191565, 14140938607

Offset

1,1

Comments

Column 4 of A250320

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A296332 A021034 A296632 * A250557 A022737 A016295

Adjacent sequences: A250313 A250314 A250315 * A250317 A250318 A250319

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved