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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

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

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

Adjacent sequences:  A253853 A253854 A253855 * A253857 A253858 A253859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 17 2015

STATUS

approved

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Last modified August 13 22:39 EDT 2022. Contains 356109 sequences. (Running on oeis4.)