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A251161 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the maximum of its diagonal elements greater than the absolute difference of its antidiagonal elements 1
552, 5054, 32083, 172457, 966212, 5804029, 35120036, 209215196, 1237992428, 7337306495, 43581646090, 258955567227, 1538048767915, 9133057761093, 54233933431813, 322072252767751, 1912682875370183, 11358698340772792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A251167

LINKS

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

FORMULA

Empirical: a(n) = 19*a(n-1) -168*a(n-2) +970*a(n-3) -4128*a(n-4) +13682*a(n-5) -36699*a(n-6) +81639*a(n-7) -152877*a(n-8) +243851*a(n-9) -334774*a(n-10) +399797*a(n-11) -419549*a(n-12) +389921*a(n-13) -322480*a(n-14) +237093*a(n-15) -153433*a(n-16) +85514*a(n-17) -39795*a(n-18) +15112*a(n-19) -4770*a(n-20) +1351*a(n-21) -352*a(n-22) +70*a(n-23) -7*a(n-24) for n>27

EXAMPLE

Some solutions for n=4

..0..0..0....1..2..3....1..0..1....1..0..0....1..0..0....3..0..3....0..2..3

..1..0..0....0..1..2....1..1..0....1..1..0....2..0..0....3..0..1....1..0..1

..1..1..1....2..0..2....2..1..1....0..1..1....2..1..1....3..3..0....1..0..0

..0..0..1....3..0..2....3..0..0....0..0..0....3..0..1....0..3..0....2..1..1

..2..0..0....3..0..2....3..3..3....2..2..1....3..2..1....0..3..2....3..2..0

CROSSREFS

Sequence in context: A119897 A014360 A158636 * A189549 A282595 A290048

Adjacent sequences:  A251158 A251159 A251160 * A251162 A251163 A251164

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified January 26 22:05 EST 2022. Contains 350601 sequences. (Running on oeis4.)