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

226, 3205, 45542, 647154, 9195809, 130668665, 1856748750, 26383648169, 374900959420, 5327190854750, 75697225335193, 1075626926043079, 15284223152250919, 217182623186202149, 3086077149239512608

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