A204302 Number of (n+1)X(n+1) 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

256, 51680, 47834122, 59151473070, 211637634795580

Offset

1,1

Comments

Diagonal of A204309

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=4
..0..2..3..0..1....3..1..1..2..0....2..2..2..2..3....1..0..1..2..1
..1..1..1..3..3....0..3..2..2..3....2..2..3..2..2....1..0..1..1..1
..1..2..3..3..2....3..1..1..3..2....2..2..2..2..3....3..2..3..1..3
..1..1..2..3..3....1..2..3..2..3....3..2..3..2..2....0..1..1..3..2
..3..2..3..3..2....2..2..3..2..3....1..3..1..3..2....3..2..3..2..2

Crossrefs

Sequence in context: A362498 A017440 A237068 * A264096 A260865 A205173

Adjacent sequences: A204299 A204300 A204301 * A204303 A204304 A204305

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved