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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2014
STATUS
approved

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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)