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A267790
Number of 4Xn 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.
1
9, 81, 729, 5081, 34173, 211555, 1262760, 7263481, 40755550, 223936008, 1210708628, 6459502002, 34095465344, 178380596163, 926424208370, 4781950926795, 24555731443566, 125543243787981, 639444488484051
OFFSET
1,1
COMMENTS
Row 4 of A267788.
FORMULA
Empirical recurrence of order 93 (see link above)
EXAMPLE
Some solutions for n=4
..1..1..1..0....0..1..0..1....0..0..0..1....0..1..1..0....0..0..1..1
..0..0..0..0....1..0..1..0....0..1..0..1....0..0..0..1....1..0..1..0
..1..1..1..1....1..0..0..1....1..1..1..0....1..0..0..1....0..1..0..0
..0..1..0..0....0..1..0..1....0..0..0..1....1..1..1..0....0..1..1..1
CROSSREFS
Cf. A267788.
Sequence in context: A171283 A174108 A254435 * A268014 A228972 A125947
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2016
STATUS
approved