A208174 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.

715, 7594479, 84091222866, 931104734002155, 10309684155118737894, 114154269785454920027391, 1263976383376771173195964686, 13995414281804368959953485044237, 154964620775524737157861783733965485

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Column 7 of A208175

Examples

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

Links

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