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A251223 Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements 1
171, 1892, 20782, 228689, 2515011, 27662994, 304255924, 3346446223, 36806732398, 404828461391, 4452610577279, 48973192395914, 538644351143299, 5924419545393448, 65161264266944558, 716693058210959682 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251228

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +39*a(n-2) -48*a(n-3) -210*a(n-4) +88*a(n-5) +260*a(n-6) -199*a(n-7) +36*a(n-8)

EXAMPLE

Some solutions for n=3

..0..1..0..0....0..1..0..1....0..0..1..0....1..1..0..0....0..0..0..1

..1..1..1..1....0..1..0..1....0..1..0..0....0..0..0..1....1..1..0..0

..0..0..0..0....1..1..0..0....0..1..1..0....0..0..0..1....0..1..0..0

..1..1..1..1....0..1..1..1....1..1..0..0....0..1..0..0....1..0..0..0

CROSSREFS

Sequence in context: A187133 A185838 A199902 * A186868 A185611 A195279

Adjacent sequences:  A251220 A251221 A251222 * A251224 A251225 A251226

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified December 2 06:44 EST 2020. Contains 338868 sequences. (Running on oeis4.)