A202881 Number of n X n 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

1, 35, 5493, 6092872, 56006562037, 4095290003129296, 2365289879500027706428, 10827985400073310953152590562, 392915439811314078675718437985175633, 112991429416970014192131075985467073204579858

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Diagonal of A202889.

Sequence in context: A231914 A202067 A336306 * A210268 A025036 A224126

Adjacent sequences: A202878 A202879 A202880 * A202882 A202883 A202884

Keyword

nonn,more

Author

R. H. Hardin, Dec 25 2011

Status

approved