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A251485 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Sequence in context: A278270 A179705 A234893 * A082242 A321866 A235835

Adjacent sequences:  A251482 A251483 A251484 * A251486 A251487 A251488

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2014

STATUS

approved

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Last modified April 25 16:59 EDT 2019. Contains 322461 sequences. (Running on oeis4.)