

A237325


Number of (n+1)X(1+1) 0..2 arrays with the maximum plus 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, 320, 1264, 5120, 20692, 82800, 332192, 1346016, 5439936, 21769152, 87340224, 353899264, 1430292992, 5723670528, 22964038912, 93049464832, 376061938688, 1504905191424, 6037857292288, 24465182810112, 98876703129600
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical: a(n) = 288*a(n4) 6720*a(n8) +33536*a(n12) for n>15


EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



