A208462 Number of nX3 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.

5, 198, 20746, 4150760, 1366230232, 675203938944, 470798015742024, 442649055938121520, 542162635236824518416, 841853575796382626351008, 1621152906552533388717492544, 3801835656372944848040523715264

Offset: 1

Author

R. H. Hardin Feb 27 2012

Keywords

• nonn

Comments

Column 3 of A208466

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..92