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A236597 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the upper median of every 2X2 subblock 1
256, 2596, 25950, 256376, 2525698, 24922062, 246386369, 2433171504, 24010605844, 237040427808, 2341100151528, 23116276195064, 228210652127196, 2253179860569112, 22248307411651820, 219673641163137064 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236601

LINKS

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

FORMULA

Empirical: a(n) = 224*a(n-3) +4264*a(n-4) +18336*a(n-5) +94100*a(n-6) +288576*a(n-7) -458324*a(n-8) -2955288*a(n-9) -9895792*a(n-10) -31179344*a(n-11) -22508592*a(n-12) +8785408*a(n-13) +23968768*a(n-14) +101248896*a(n-15) +87015168*a(n-16) -13844480*a(n-17) -14419968*a(n-18) -26182656*a(n-19) -23973888*a(n-20) for n>22

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A188842 A188705 A236601 * A235779 A235559 A235556

Adjacent sequences:  A236594 A236595 A236596 * A236598 A236599 A236600

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2014

STATUS

approved

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Last modified February 22 15:52 EST 2019. Contains 320399 sequences. (Running on oeis4.)