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A204222
Number of (n+1)X(n+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards
0
81, 4539, 752562, 129062037, 45791699846, 13629970952083, 7163822258608797
OFFSET
1,1
COMMENTS
Diagonal of A204230
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 13 2012
STATUS
approved