A238065 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

256, 1644, 10700, 67056, 438768, 2752364, 17963540, 112686608, 736140896, 4617797164, 30156164612, 189170092912, 1235514228944, 7750383935532, 50617266440500, 317522485495440, 2073753899516928, 13008669849171308

Offset

1,1

Comments

Column 1 of A238072

Links

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

Formula

Empirical: a(n) = 23*a(n-2) +689*a(n-4) +1889*a(n-6) +1784*a(n-8) +512*a(n-10) for n>13

Example

Some solutions for n=4
..1..1....3..0....0..0....2..0....1..0....2..1....1..1....1..0....2..0....1..2
..2..1....0..0....1..0....0..0....2..2....2..3....1..2....1..0....1..3....3..2
..2..3....2..1....2..2....1..0....3..2....2..0....1..0....2..0....1..2....3..2
..3..2....1..1....3..2....0..2....3..1....0..2....1..1....2..3....2..2....3..1
..1..2....1..3....1..1....3..3....0..2....1..3....3..3....1..1....0..2....0..1

Crossrefs

Sequence in context: A237927 A237922 A238072 * A237538 A237532 A237175

Adjacent sequences: A238062 A238063 A238064 * A238066 A238067 A238068

Keyword

nonn

Author

R. H. Hardin, Feb 17 2014

Status

approved