A251059 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having x11-x00 less than x10-x01

222, 2740, 31895, 379440, 4499219, 53420941, 634161915, 7528829372, 89381885986, 1061143804301, 12597914485712, 149562686271463, 1775611051165233, 21080088759507993, 250263221101743326, 2971129803512557016

Offset

1,1

Comments

Column 2 of A251065

Links

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

Formula

Empirical: a(n) = 14*a(n-1) -12*a(n-2) -184*a(n-3) +281*a(n-4) +477*a(n-5) -863*a(n-6) -69*a(n-7) +517*a(n-8) -106*a(n-9) -80*a(n-10) +24*a(n-11)

Example

Some solutions for n=3
..2..0..0....2..1..2....1..2..1....0..2..2....0..0..0....0..0..2....0..0..2
..0..2..2....0..2..1....0..0..1....1..0..1....1..2..2....1..2..2....0..2..0
..2..0..2....0..0..2....0..1..1....1..2..2....0..0..1....1..2..2....0..0..2
..0..2..1....0..1..2....0..1..1....0..1..2....0..1..1....2..1..2....1..2..0

Crossrefs

Sequence in context: A063352 A250521 A043499 * A220230 A281696 A280311

Adjacent sequences: A251056 A251057 A251058 * A251060 A251061 A251062

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved