A208407 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

715, 10370330, 157873031498, 2403711876698218, 36598079445605633928, 557229580446475130201608, 8484183047877022205116428184, 129177209027669581083328287797640, 1966807085374417176424317546443585928

Offset: 1

Author

R. H. Hardin Feb 26 2012

Keywords

• nonn

Comments

Column 7 of A208408

Examples

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

Links

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