A250565 Number of length 6+2 0..n arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero

128, 3113, 30780, 177421, 744564, 2457921, 6924692, 17094253, 38304880, 78984989, 152812848, 279129849, 487306780, 816235605, 1321428708, 2073455817

Offset

1,1

Comments

Row 6 of A250561

Links

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

Example

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

Crossrefs

Sequence in context: A224414 A128802 A297613 * A264383 A022150 A269001

Adjacent sequences: A250562 A250563 A250564 * A250566 A250567 A250568

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved