A235426 Number of (n+1)X(1+1) 0..3 arrays with the difference between each 2X2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise

256, 3038, 33610, 344668, 3402366, 32542312, 304784986, 2807381170, 25538118636, 230002990420, 2055091563588, 18243652764916, 161094988392244, 1416214588819266, 12404115758918922, 108303485972137448

Offset

1,1

Comments

Column 1 of A235430

Links

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

Formula

Empirical: a(n) = 15*a(n-1) -17*a(n-2) -518*a(n-3) +1159*a(n-4) +5713*a(n-5) -11569*a(n-6) -22194*a(n-7) +35356*a(n-8) +29720*a(n-9) -34208*a(n-10) -11136*a(n-11) +7680*a(n-12)

Example

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

Crossrefs

Sequence in context: A205928 A235665 A235430 * A236299 A236296 A138333

Adjacent sequences: A235423 A235424 A235425 * A235427 A235428 A235429

Keyword

nonn

Author

R. H. Hardin, Jan 10 2014

Status

approved