A245847 Number of length n 0..4 arrays with new values introduced in order from both ends, and least squares fitting to a straight line with slope zero, with a single point taken as having zero slope.

1, 1, 2, 2, 5, 5, 15, 17, 78, 102, 568, 918, 6115, 11063, 84095, 167139, 1377562, 2919818, 25322454, 55877190, 500009859, 1130615111, 10314022021, 23685168139, 218801537756, 507728746032, 4731965243042, 11064419359152, 103808357373783

Offset

1,3

Comments

Column 4 of A245851

Links

R. H. Hardin, Table of n, a(n) for n = 1..123

Example

Some solutions for n=12
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....0....1....1....1....0....1....1....1....1....1....1....0....1....1....1
..1....0....0....1....2....1....2....0....0....0....0....2....0....1....2....2
..1....1....2....2....2....1....1....2....0....2....0....3....1....0....0....3
..2....0....0....1....3....0....3....2....1....1....1....3....2....2....1....2
..1....2....2....1....0....0....1....3....1....0....1....1....2....1....2....0
..0....2....1....2....0....0....2....0....2....0....1....4....2....3....3....2
..1....0....1....3....3....0....1....3....2....2....1....2....2....1....2....3
..0....1....2....2....2....1....2....2....1....0....0....3....1....2....2....2
..1....0....1....0....2....1....2....0....0....1....0....2....0....1....0....2
..1....0....0....1....1....0....1....1....0....1....1....1....0....0....1....1
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

Crossrefs

Sequence in context: A164904 A188164 A245846 * A245848 A245849 A245850

Adjacent sequences: A245844 A245845 A245846 * A245848 A245849 A245850

Keyword

nonn

Author

R. H. Hardin, Aug 04 2014

Status

approved