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A268010
Number of 1Xn 0..n arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.
3
1, 2, 4, 12, 40, 154, 656, 3074, 15616, 85360, 498464, 3092450, 20286360, 140153382, 1016262080, 7710988372, 61062381784, 503482376930, 4313580705728, 38328590370762, 352618807559008, 3353663977088848, 32927374589861296
OFFSET
1,2
COMMENTS
Row 1 of A268009.
LINKS
EXAMPLE
Some solutions for n=8
..0..1..0..1..0..2..0..0....0..1..1..2..3..4..2..1....0..1..2..3..0..2..4..3
CROSSREFS
Cf. A268009.
Sequence in context: A268953 A268954 A268955 * A215073 A215074 A215070
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 24 2016
STATUS
approved