A208472 Number of 7Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

877, 190899322, 470798015742024, 6105599904286957450405, 279322601688949336349340289673, 35487456577214016192433880229514302813, 10658767342117292737413813034097966371526603430

Offset: 1

Author

R. H. Hardin Feb 27 2012

Keywords

• nonn

Comments

Row 7 of A208466

Examples

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