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A253224
Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
0
16, 132, 494, 1498, 3936, 9630, 22656, 52110, 118182, 265458, 591924, 1311966, 2892738, 6348402, 13873152, 30199422, 65504766, 141618834, 305248332, 656098110
OFFSET
1,1
COMMENTS
Diagonal of A253231.
EXAMPLE
Some solutions for n=4
..0..1..1..1..0....1..1..1..0..1....0..1..1..0..0....0..1..1..1..1
..0..1..1..1..0....1..1..1..0..0....0..1..1..0..0....0..1..1..1..1
..0..1..1..1..0....1..1..1..0..0....1..1..1..0..0....0..1..1..1..1
..1..1..1..1..0....1..1..1..0..0....1..1..1..0..0....1..1..0..0..0
..0..0..0..1..1....1..0..0..0..0....1..0..0..0..1....0..0..0..0..0
CROSSREFS
Cf. A253231.
Sequence in context: A055914 A255816 A335560 * A334979 A183535 A197278
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2014
STATUS
approved