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A253448
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically
0
81, 1975, 7782, 15730, 44242, 147332, 526430, 1956194, 7444718, 28766354, 112273790, 441202754, 1742089358
OFFSET
1,1
COMMENTS
Diagonal of A253456
EXAMPLE
Some solutions for n=4
..1..1..0..0..1....1..1..2..1..2....1..1..1..1..0....2..2..2..2..2
..2..2..1..1..2....0..0..1..0..1....1..1..1..1..0....1..1..1..1..1
..2..2..1..1..2....0..0..1..0..1....2..2..2..2..1....0..0..0..0..0
..2..2..1..1..2....1..1..2..1..2....1..1..1..1..0....1..1..1..1..1
..1..1..0..0..2....0..0..1..0..2....2..2..2..2..2....0..0..0..0..0
CROSSREFS
Sequence in context: A237957 A238038 A236088 * A205978 A037211 A238237
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2015
STATUS
approved