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A236604 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the lower median minus the minimum of every 2X2 subblock 1
81, 426, 2269, 12004, 63945, 339684, 1806104, 9590924, 50981860, 270885808, 1439698020, 7649649584, 40652677572, 216021080080, 1147974683632, 6100208729024, 32416974402064, 172262578560928, 915411064116880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236610

LINKS

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

FORMULA

Empirical: a(n) = 28*a(n-3) +336*a(n-4) +744*a(n-5) +3360*a(n-6) +6176*a(n-7) +8308*a(n-8) +14576*a(n-9) -20528*a(n-10) -34304*a(n-11) -86784*a(n-12) -144128*a(n-13) +1536*a(n-14) +8192*a(n-15) +147456*a(n-16) +229376*a(n-17)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A206407 A236610 A236704 * A236698 A235421 A236282

Adjacent sequences:  A236601 A236602 A236603 * A236605 A236606 A236607

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2014

STATUS

approved

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Last modified January 17 23:15 EST 2019. Contains 319251 sequences. (Running on oeis4.)