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A236791 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal 1
81, 255, 825, 2817, 9717, 34317, 122305, 442285, 1612085, 5935493, 21990145, 82051485, 307574133, 1158698629, 4379531169, 16610367645, 63145291189, 240620562981, 918393173569, 3511019670621, 13437773070709, 51488379790533 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236798

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +8*a(n-2) -204*a(n-3) +224*a(n-4) +1972*a(n-5) -3810*a(n-6) -9220*a(n-7) +24389*a(n-8) +20868*a(n-9) -81294*a(n-10) -13536*a(n-11) +150316*a(n-12) -33360*a(n-13) -148072*a(n-14) +72384*a(n-15) +63616*a(n-16) -48128*a(n-17) -2816*a(n-18) +8192*a(n-19) -1536*a(n-20)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236798 A237067 A236782 * A237060 A340697 A237637

Adjacent sequences:  A236788 A236789 A236790 * A236792 A236793 A236794

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified December 4 08:53 EST 2021. Contains 349481 sequences. (Running on oeis4.)