A249976 Number of length n+1 0..2*2 arrays with the sum of the absolute values of adjacent differences equal to n*2.

6, 24, 88, 384, 1606, 7138, 31380, 141272, 635686, 2890884, 13175784, 60384934, 277442652, 1279055676, 5909701748, 27368939688, 126981852654, 590182327132, 2747109920736, 12804571294224, 59756343262648, 279183944932752

Offset: 1

Author

R. H. Hardin, Nov 10 2014

Keywords

• nonn

Comments

Column 2 of A249982

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210