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A237683 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the upper median plus the lower median minus the minimum of every 2X2 subblock 6
81, 474, 474, 2741, 4146, 2741, 15948, 35620, 35620, 15948, 93093, 308814, 449258, 308814, 93093, 541880, 2688928, 5732688, 5732688, 2688928, 541880, 3152844, 23395998, 74265677, 109962932, 74265677, 23395998, 3152844, 18356756 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

........81.........474.........2741........15948.........93093........541880

.......474........4146........35620.......308814.......2688928......23395998

......2741.......35620.......449258......5732688......74265677.....959069036

.....15948......308814......5732688....109962932....2160608712...42145629006

.....93093.....2688928.....74265677...2160608712...65107866022.1938146594012

....541880....23395998....959069036..42145629006.1938146594012

...3152844...203035400..12309130146.813403060652

..18356756..1763640726.158172430796

.106893088.15330212940

.622285828

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 18]

k=2: [order 67] for n>69

EXAMPLE

Some solutions for n=2 k=4

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

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

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

CROSSREFS

Sequence in context: A253524 A254422 A253517 * A236640 A236780 A237678

Adjacent sequences:  A237680 A237681 A237682 * A237684 A237685 A237686

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Feb 11 2014

STATUS

approved

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Last modified October 28 21:20 EDT 2020. Contains 338064 sequences. (Running on oeis4.)