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A267668
Number of 3Xn 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.
1
4, 32, 108, 500, 1372, 5324, 13500, 48668, 119164, 415292, 1000188, 3429500, 8193532, 27871484, 66325500, 224727548, 533731324, 1804870652, 4282396668, 14467221500, 34309431292, 115850907644, 274676629500, 927260024828
OFFSET
1,1
COMMENTS
Row 3 of A267667.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +14*a(n-2) -14*a(n-3) -56*a(n-4) +56*a(n-5) +64*a(n-6) -64*a(n-7)
EXAMPLE
Some solutions for n=8
..0..1..0..1..0..1..0..1....0..1..0..1..0..0..1..1....0..1..0..1..0..1..0..1
..1..0..1..0..1..0..1..1....0..0..1..0..1..1..0..1....0..0..1..0..1..0..1..1
..1..1..0..1..0..0..1..0....1..0..1..0..1..1..0..1....1..0..1..1..0..0..1..0
CROSSREFS
Cf. A267667.
Sequence in context: A211626 A211627 A033430 * A338322 A239056 A088658
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2016
STATUS
approved