A236990 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the lower median minus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

81, 360, 1600, 7200, 32400, 144000, 640000, 2880000, 12960000, 57600000, 256000000, 1152000000, 5184000000, 23040000000, 102400000000, 460800000000, 2073600000000, 9216000000000, 40960000000000, 184320000000000

Offset

1,1

Comments

Column 1 of A236997

Links

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

Formula

Empirical: a(n) = 400*a(n-4)

Example

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

Crossrefs

Sequence in context: A236065 A206676 A205520 * A236058 A205513 A017378

Adjacent sequences: A236987 A236988 A236989 * A236991 A236992 A236993

Keyword

nonn

Author

R. H. Hardin, Feb 02 2014

Status

approved