A237633 Number of (n+1)X(4+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

1786, 2356, 1488, 2012, 2816, 4440, 5976, 10104, 14168, 22294, 29908, 50502, 70828, 111468, 149540, 252510, 354140, 557340, 747700, 1262550, 1770700, 2786700, 3738500, 6312750, 8853500, 13933500, 18692500, 31563750, 44267500, 69667500

Offset

1,1

Comments

Column 4 of A237637

Links

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

Formula

Empirical: a(n) = 5*a(n-4) for n>14

Example

Some solutions for n=5
..0..0..0..1..2....2..2..1..0..1....2..2..1..0..1....1..1..2..0..0
..2..1..0..1..2....1..0..0..0..2....1..0..0..0..2....0..2..1..0..1
..0..2..0..0..0....1..0..1..2..1....2..0..1..2..1....2..0..0..0..2
..0..1..2..1..0....0..0..2..0..0....0..0..2..0..0....1..0..1..2..1
..0..0..0..2..1....1..2..1..0..1....1..2..1..0..1....0..0..2..0..0
..2..1..0..1..2....2..0..0..0..1....2..0..0..0..2....1..2..1..0..1

Crossrefs

Sequence in context: A013593 A152943 A202401 * A244275 A235927 A090232

Adjacent sequences: A237630 A237631 A237632 * A237634 A237635 A237636

Keyword

nonn

Author

R. H. Hardin, Feb 10 2014

Status

approved