A237801 Number of (n+1) X (n+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock equal.

81, 1775, 94325, 14666689, 5485899329, 5517963998459, 13522001820784289, 86139022248212485459, 1347161867209502898892029

Offset

1,1

Comments

Diagonal of A237809.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A237809.

Sequence in context: A206677 A237091 A253306 * A328683 A236057 A205910

Adjacent sequences: A237798 A237799 A237800 * A237802 A237803 A237804

Keyword

nonn

Author

R. H. Hardin, Feb 13 2014

Status

approved