A204222 Number of (n+1)X(n+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

81, 4539, 752562, 129062037, 45791699846, 13629970952083, 7163822258608797

Offset

1,1

Comments

Diagonal of A204230

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A006312 A183962 A174698 * A264193 A232952 A205285

Adjacent sequences: A204219 A204220 A204221 * A204223 A204224 A204225

Keyword

nonn

Author

R. H. Hardin Jan 13 2012

Status

approved