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A237915 Number of (n+1)X(1+1) 0..3 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1584, 9892, 63476, 406468, 2591160, 16574240, 105734776, 676470380, 4314907116, 27605297244, 176086915376, 1126539110360, 7185841737072, 45972584759476, 293245625954804, 1876081040647348, 11966954890116312 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237921

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-2) +1028*a(n-4) +10373*a(n-6) +27367*a(n-8) -32996*a(n-10) -169776*a(n-12) -127168*a(n-14) +64512*a(n-16) +589824*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237677 A237672 A237921 * A238081 A238074 A251974

Adjacent sequences:  A237912 A237913 A237914 * A237916 A237917 A237918

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2014

STATUS

approved

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Last modified February 18 04:48 EST 2020. Contains 332011 sequences. (Running on oeis4.)