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A237385 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median minus the minimum of every 2X2 subblock 1
81, 434, 2336, 12624, 68064, 366568, 1976940, 10657560, 57441532, 309578264, 1668794652, 8995139000, 48484851148, 261335232440, 1408647749404, 7592807398296, 40926289471308, 220597727495896, 1189054017281884 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237391

LINKS

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

FORMULA

Empirical: a(n) = 30*a(n-3) +349*a(n-4) +818*a(n-5) +3504*a(n-6) +7320*a(n-7) +9876*a(n-8) +18056*a(n-9) -14960*a(n-10) -63872*a(n-11) -133008*a(n-12) -307168*a(n-13) -194624*a(n-14) +71296*a(n-15) +344832*a(n-16) +1077248*a(n-17) +985088*a(n-18) -16384*a(n-19) -212992*a(n-20)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236282 A235417 A237391 * A237308 A237301 A237945

Adjacent sequences:  A237382 A237383 A237384 * A237386 A237387 A237388

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 07 2014

STATUS

approved

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Last modified January 17 15:33 EST 2020. Contains 330958 sequences. (Running on oeis4.)