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A251313 Number of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having the maximum of its diagonal elements greater than the absolute difference of its antidiagonal elements 1
149, 720, 3369, 16006, 76167, 361845, 1720147, 8186775, 38968823, 185439356, 882418813, 4199534512, 19986994528, 95122402403, 452701564741, 2154494292273, 10253737220701, 48799856644887, 232249015459479, 1105323374632293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A251317

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) -77*a(n-2) +305*a(n-3) -889*a(n-4) +1888*a(n-5) -2951*a(n-6) +3420*a(n-7) -2877*a(n-8) +1673*a(n-9) -645*a(n-10) +176*a(n-11) -83*a(n-12) +28*a(n-13) -6*a(n-14) +4*a(n-15) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A142629 A078849 A078950 * A142269 A177850 A158717

Adjacent sequences:  A251310 A251311 A251312 * A251314 A251315 A251316

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified October 23 20:31 EDT 2021. Contains 348215 sequences. (Running on oeis4.)