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A237633 Number of (n+1)X(4+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
1786, 2356, 1488, 2012, 2816, 4440, 5976, 10104, 14168, 22294, 29908, 50502, 70828, 111468, 149540, 252510, 354140, 557340, 747700, 1262550, 1770700, 2786700, 3738500, 6312750, 8853500, 13933500, 18692500, 31563750, 44267500, 69667500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A237637

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-4) for n>14

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A013593 A152943 A202401 * A244275 A235927 A090232

Adjacent sequences:  A237630 A237631 A237632 * A237634 A237635 A237636

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2014

STATUS

approved

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Last modified January 28 10:49 EST 2022. Contains 350655 sequences. (Running on oeis4.)