A184072 Number of (n+1)X(n+1) 0..2 arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one

29, 74, 1436, 44050, 5727704, 2187790488

Offset

1,1

Comments

Diagonal of A184081

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X4
..0..1..1..1....0..1..1..2....0..0..0..2....0..0..1..1....0..0..1..2
..1..1..1..1....1..1..1..0....0..1..1..0....0..1..0..1....0..1..0..0
..1..1..1..2....1..1..2..1....1..0..1..1....0..1..1..1....1..0..2..0
..2..1..2..1....2..0..2..0....1..0..2..0....2..0..1..0....2..0..1..0
...
...3..4..4.......3..4..4.......1..2..3.......1..2..3.......1..2..3...
...4..4..5.......4..5..4.......2..3..3.......2..3..3.......2..3..2...
...5..5..6.......4..5..5.......2..3..4.......3..3..3.......3..3..3...

Crossrefs

Sequence in context: A210499 A161617 A142305 * A071110 A263534 A273360

Adjacent sequences: A184069 A184070 A184071 * A184073 A184074 A184075

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved