A205409 Number of (n+2)X4 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order.

3868, 44596, 549414, 5686031, 64878898, 768581101, 8606465750, 98080551694, 1133347809296, 12914400827409, 147488385577992, 1691863713691698, 19345357758536500, 221200783159493283, 2532531552219620474

Offset: 1

Author

R. H. Hardin Jan 26 2012

Keywords

• nonn

Comments

Column 2 of A205415

Examples

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

Links

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