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A251485 Number of (n+1) X (2+1) 0..3 arrays with no 2 X 2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements. 1
3456, 186304, 10046784, 541815424, 29219848960, 1575813859456, 84982973330688, 4583095819732736, 247164420634563840, 13329472755050099712, 718852832815666617344, 38767429496362104931840, 2090711090157985348366336 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A251491.
LINKS
FORMULA
Empirical: a(n) = 64*a(n-1) -556*a(n-2) +704*a(n-3) -356*a(n-4) -3968*a(n-5) +36*a(n-6) +1152*a(n-7).
EXAMPLE
Some solutions for n=2
..2..1..0....0..1..2....0..2..3....1..2..3....1..1..1....1..1..2....1..3..0
..3..2..0....3..1..1....2..2..0....1..3..2....1..2..2....1..1..2....1..0..1
..2..0..1....3..0..2....1..2..2....2..3..2....3..1..2....1..1..3....1..3..1
CROSSREFS
Cf. A251491.
Sequence in context: A278270 A179705 A234893 * A082242 A321866 A235835
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2014
STATUS
approved

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Last modified February 22 06:21 EST 2024. Contains 370240 sequences. (Running on oeis4.)