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A237921 T(n,k)=Number of (n+1)X(k+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 7
256, 1584, 1584, 9892, 14564, 9892, 63476, 133528, 133528, 63476, 406468, 1282504, 1907520, 1282504, 406468, 2591160, 12149024, 27873820, 27873820, 12149024, 2591160, 16574240, 115206520, 405401852, 636891488, 405401852, 115206520 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

........256.........1584............9892............63476............406468

.......1584........14564..........133528..........1282504..........12149024

.......9892.......133528.........1907520.........27873820.........405401852

......63476......1282504........27873820........636891488.......14163256928

.....406468.....12149024.......405401852......14163256928......488835819834

....2591160....115206520......5873296416.....319272033708....16925434187136

...16574240...1092851528.....85701783182....7170378195892...590192559141494

..105734776..10375258140...1241851571792..161382511774196.20435454685816288

..676470380..98442896216..18123171520244.3629106051378200

.4314907116.934214824740.262625441797028

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 18]

k=2: [order 56]

EXAMPLE

Some solutions for n=2 k=4

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

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

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

CROSSREFS

Sequence in context: A237399 A237677 A237672 * A237915 A238081 A238074

Adjacent sequences:  A237918 A237919 A237920 * A237922 A237923 A237924

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Feb 15 2014

STATUS

approved

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Last modified April 5 16:37 EDT 2020. Contains 333245 sequences. (Running on oeis4.)