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A251395 Number of (n+1)X(1+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
226, 3205, 45542, 647154, 9195809, 130668665, 1856748750, 26383648169, 374900959420, 5327190854750, 75697225335193, 1075626926043079, 15284223152250919, 217182623186202149, 3086077149239512608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A251402

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -30*a(n-2) +69*a(n-3) -62*a(n-4) +30*a(n-5) -8*a(n-6) +a(n-7)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A233943 A234155 A251402 * A251507 A251500 A050847

Adjacent sequences:  A251392 A251393 A251394 * A251396 A251397 A251398

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2014

STATUS

approved

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Last modified October 1 19:48 EDT 2022. Contains 357172 sequences. (Running on oeis4.)