A250558 Number of length n+2 0..5 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.

18, 200, 1648, 13732, 106362, 744564, 4808120, 29723864, 180290280, 1085927844, 6524507992, 39167586296, 235053968050, 1410450413584, 8463032114236, 50779132943420

Offset

1,1

Comments

Column 5 of A250561.

Links

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

Example

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

Crossrefs

Cf. A250561.

Sequence in context: A026881 A181961 A250317 * A282833 A181400 A282020

Adjacent sequences: A250555 A250556 A250557 * A250559 A250560 A250561

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved