A250557 Number of length n+2 0..4 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero

13, 117, 761, 5105, 31525, 177421, 937817, 4803653, 24257725, 121800949, 610147053, 3053493273, 15274472475, 76391277073, 382008613455, 1910192140573, 9551389260819, 47758200502193, 238794678323345, 1193984277090533

Offset

1,1

Comments

Column 4 of A250561

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

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

Crossrefs

Sequence in context: A021034 A296632 A250316 * A022737 A016295 A225965

Adjacent sequences: A250554 A250555 A250556 * A250558 A250559 A250560

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved