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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 1
81, 360, 1600, 7200, 32400, 144000, 640000, 2880000, 12960000, 57600000, 256000000, 1152000000, 5184000000, 23040000000, 102400000000, 460800000000, 2073600000000, 9216000000000, 40960000000000, 184320000000000 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 8 21:27 EDT 2022. Contains 356016 sequences. (Running on oeis4.)