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A253856 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally and vertically 2
512, 3264, 19456, 114880, 660480, 3727552, 20872192, 116568256, 649733120, 3617345728, 20128173056, 111975383232, 622846260224, 3464240431296, 19267225623552, 107157701398720, 595968823411712, 3314528026816704 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A253863
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -13*a(n-2) -8*a(n-3) +77*a(n-4) -392*a(n-5) +721*a(n-6) -504*a(n-7) +176*a(n-8) +384*a(n-9) -960*a(n-10) +512*a(n-11)
EXAMPLE
Some solutions for n=4
..0..1..1....0..1..0....0..1..0....1..1..1....0..1..1....0..1..0....0..1..0
..1..0..0....1..1..1....1..1..1....1..0..1....0..0..0....0..1..0....0..1..0
..1..0..0....1..0..0....0..0..0....0..0..0....0..1..1....1..0..1....1..1..1
..1..1..0....0..1..1....1..1..0....1..1..0....0..1..0....1..0..1....1..1..1
..0..0..1....1..0..1....1..0..0....1..1..0....0..1..1....0..1..1....0..0..1
..0..0..1....1..1..1....1..0..1....1..0..1....0..0..1....0..0..0....1..0..1
CROSSREFS
Sequence in context: A254161 A254491 A253863 * A253871 A253544 A253537
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2015
STATUS
approved

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Last modified April 21 06:29 EDT 2024. Contains 371850 sequences. (Running on oeis4.)