A252929 Number of nX7 nonnegative integer arrays with upper left 0 and lower right n+7-6 and value increasing by 0 or 1 with every step right or down.

15, 483, 13976, 315198, 5385305, 71297441, 759337545, 6725497344, 50869309436, 335549742230, 1963313662947, 10332594393296, 49485574097413, 217813226273441, 888570804281664, 3384240524056852, 12109669540486657

Offset: 1

Author

R. H. Hardin, Dec 24 2014

Keywords

• nonn

Comments

Column 7 of A252930

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 28

Formula

Empirical polynomial of degree 28 (see link above)