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A237569 Number of (n+1)X(1+1) 0..3 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1876, 13924, 103264, 769680, 5705156, 42501300, 315065200, 2347267424, 17400203636, 129631996580, 960959725312, 7159191300272, 53070925060004, 395380448791316, 2930946979641872, 21835672557183872, 161867373265982548 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237574

LINKS

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

FORMULA

Empirical: a(n) = 23*a(n-2) +1473*a(n-4) +15833*a(n-6) +60176*a(n-8) +65344*a(n-10) -70656*a(n-12) -139264*a(n-14) for n>15

EXAMPLE

Some solutions for n=4

..2..3....1..1....2..1....1..1....3..2....2..2....2..2....3..2....3..3....0..2

..1..1....1..3....3..2....0..3....1..1....2..2....1..1....1..1....0..1....2..1

..3..3....1..2....1..1....3..2....3..0....1..1....1..3....1..0....1..0....3..2

..2..0....0..1....1..0....2..0....1..0....3..1....0..0....0..3....0..0....0..1

..2..2....3..0....2..3....1..0....3..3....3..2....3..0....3..3....1..3....0..0

CROSSREFS

Sequence in context: A237158 A237151 A237574 * A237544 A206752 A237539

Adjacent sequences: A237566 A237567 A237568 * A237570 A237571 A237572

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2014

STATUS

approved

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Last modified February 6 23:12 EST 2023. Contains 360111 sequences. (Running on oeis4.)