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A237230
Number of (n+1)X(4+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
1
2784, 10888, 29456, 83436, 233536, 671080, 1919288, 5542856, 15833748, 45309424, 129364012, 371396844, 1063000280, 3048786056, 8719902452, 24994666460, 71536549320, 205067864500, 587032939664, 1682282732208, 4816175986888
OFFSET
1,1
COMMENTS
Column 4 of A237234
LINKS
FORMULA
Empirical: a(n) = 4*a(n-2) +3*a(n-3) +24*a(n-4) +21*a(n-5) +28*a(n-6) -64*a(n-7) -199*a(n-8) -396*a(n-9) -578*a(n-10) -30*a(n-11) -136*a(n-12) -192*a(n-13) for n>16
EXAMPLE
Some solutions for n=4
..2..0..0..1..2....1..2..2..0..1....1..1..2..2..2....0..2..2..0..1
..1..1..1..2..2....0..1..1..0..1....0..0..1..1..0....1..1..2..1..0
..2..1..1..2..2....0..1..1..1..2....2..1..1..1..0....1..0..1..2..2
..1..0..0..1..1....1..2..1..1..2....2..1..1..2..1....2..1..0..1..2
..1..0..0..0..2....2..2..0..0..0....2..0..0..1..1....1..2..0..0..0
CROSSREFS
Sequence in context: A188415 A236125 A251844 * A206516 A119377 A014895
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2014
STATUS
approved