A204229 Number of (n+1)X8 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

751689, 67329896, 5466340007, 239090847020, 10297878073062, 271354063234561, 7163822258608797, 130426974499112184

Offset: 1

Author

R. H. Hardin Jan 13 2012

Keywords

• nonn

Comments

Column 7 of A204230

Examples

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