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A237861 Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
81, 336, 1414, 6030, 25525, 107272, 453088, 1919632, 8117752, 34231344, 144659936, 611705384, 2586040156, 10917301088, 46143495072, 194990974880, 824264967728, 3481115148416, 14714216616096, 62164050866784, 262771277795472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237868

LINKS

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

FORMULA

Empirical: a(n) = 252*a(n-4) +1304*a(n-6) -1908*a(n-8) -1312*a(n-10) +1280*a(n-12) -2304*a(n-14)

EXAMPLE

Some solutions for n=5

..0..2....0..1....2..2....1..0....0..1....1..2....2..0....1..1....2..2....1..2

..1..1....2..2....2..1....2..0....2..2....2..2....2..2....2..0....2..1....2..1

..1..1....1..1....0..1....1..1....2..0....0..0....1..2....2..1....1..2....0..0

..0..1....0..0....2..2....1..1....1..2....1..2....1..0....0..1....2..2....0..2

..0..2....1..0....2..0....1..0....1..0....1..2....1..0....1..0....1..1....0..1

..1..1....2..0....1..2....2..0....2..0....0..0....2..1....1..1....1..1....1..1

CROSSREFS

Sequence in context: A237481 A237474 A237868 * A236902 A236895 A237965

Adjacent sequences:  A237858 A237859 A237860 * A237862 A237863 A237864

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 14 2014

STATUS

approved

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Last modified August 19 09:19 EDT 2022. Contains 356221 sequences. (Running on oeis4.)