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A251168 Number of (n+1)X(1+1) 0..3 arrays with no 2X2 subblock having the minimum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
136, 1192, 10950, 100462, 923568, 8489391, 78041038, 717407430, 6594934034, 60625431213, 557313169470, 5123228901373, 47096454988079, 432944947883506, 3979945582315056, 36586561212082291, 336330342630415136 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A251175

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +16*a(n-2) -40*a(n-3) -63*a(n-4) +38*a(n-5) +87*a(n-6) +11*a(n-7) -35*a(n-8) -10*a(n-9) +5*a(n-10) -2*a(n-11) -4*a(n-12) -2*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A234162 A262091 A251175 * A023070 A015163 A235190

Adjacent sequences:  A251165 A251166 A251167 * A251169 A251170 A251171

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified June 27 13:59 EDT 2022. Contains 354896 sequences. (Running on oeis4.)