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A237678 Number of (n+1)X(1+1) 0..2 arrays colored with the upper median plus the lower median minus the minimum of every 2X2 subblock 1
81, 474, 2741, 15948, 93093, 541880, 3152844, 18356756, 106893088, 622285828, 3622715432, 21091482008, 122794559800, 714891615808, 4162016007648, 24230928689312, 141070302809152, 821296712783104, 4781509809549568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237683

LINKS

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

FORMULA

Empirical: a(n) = 72*a(n-3) +456*a(n-4) +1084*a(n-5) +3312*a(n-6) +712*a(n-7) -9384*a(n-8) -26848*a(n-9) -73104*a(n-10) +19232*a(n-11) +112256*a(n-12) +249216*a(n-13) +378368*a(n-14) -641536*a(n-15) -627712*a(n-16) +231424*a(n-17) +372736*a(n-18)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237683 A236640 A236780 * A236635 A236775 A205293

Adjacent sequences:  A237675 A237676 A237677 * A237679 A237680 A237681

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 11 2014

STATUS

approved

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Last modified May 23 07:08 EDT 2019. Contains 323508 sequences. (Running on oeis4.)