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A237532
Number of (n+1)X(1+1) 0..3 arrays with the upper median minus the lower median of every 2X2 subblock equal
1
256, 1692, 11602, 83104, 598364, 4364082, 31944336, 235256268, 1738258026, 12893878848, 95919856580, 715664084818, 5352837879288, 40130893138332, 301489296666562, 2269299751178560, 17109984950539036, 129203951232487378
OFFSET
1,1
COMMENTS
Column 1 of A237538
LINKS
FORMULA
Empirical: a(n) = 18*a(n-1) -64*a(n-2) -539*a(n-3) +3795*a(n-4) +1414*a(n-5) -58056*a(n-6) +84851*a(n-7) +309622*a(n-8) -875960*a(n-9) -155176*a(n-10) +2621808*a(n-11) -2284736*a(n-12) -1589504*a(n-13) +3589120*a(n-14) -2039808*a(n-15) +393216*a(n-16)
EXAMPLE
Some solutions for n=4
..2..0....1..1....2..1....2..3....2..1....3..0....3..2....0..1....1..1....1..2
..0..1....0..1....1..2....3..2....3..0....1..0....2..0....2..0....1..0....0..2
..2..3....2..1....0..2....2..3....1..2....2..0....3..2....1..2....1..1....1..0
..3..2....1..1....0..1....2..3....2..1....2..1....2..0....0..0....0..1....2..0
..2..3....0..2....3..2....2..3....3..1....2..1....0..0....1..1....3..1....1..2
CROSSREFS
Sequence in context: A238072 A238065 A237538 * A237175 A237169 A237936
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2014
STATUS
approved