A203974 Number of nX7 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by 0 1 to the left or above.

44, 5569, 1107082, 180623180, 30104480870, 5061444598545, 847220834970347, 141937054743243405, 23779975312437117115, 3983658769957290205062, 667379066179974381638813, 111804522576410924713391638

Offset: 1

Author

R. H. Hardin Jan 08 2012

Keywords

• nonn

Comments

Column 7 of A203975

Examples

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

Links

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