A184086 Number of (n+1)X(n+1) 0..3 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

86, 260, 9483, 368326, 91203410, 55632308352

Offset

1,1

Comments

Diagonal of A184095

Links

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

Example

Some solutions for 4X4
..0..1..1..2....1..2..3..3....1..2..2..3....1..1..2..2....1..1..2..2
..1..0..1..0....1..3..0..2....2..2..2..2....1..2..0..2....1..3..0..2
..1..1..2..0....1..3..2..3....2..2..2..3....2..0..3..0....2..1..3..1
..2..0..0..1....2..3..0..2....2..2..3..1....3..0..1..0....2..3..0..3
...
...2..3..4.......7..8..8.......7..8..9.......5..5..6.......6..6..6...
...3..4..3.......8..8..7.......8..8..9.......5..5..5.......7..7..6...
...4..3..3.......9..8..7.......8..9..9.......5..4..4.......8..7..7...

Crossrefs

Sequence in context: A184087 A304518 A306112 * A113690 A043379 A256804

Adjacent sequences: A184083 A184084 A184085 * A184087 A184088 A184089

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved