A236028 - OEIS

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A236028

Number of (n+1)X(1+1) 0..2 arrays colored with the difference of the upper median and the lower median in each 2X2 subblock

81, 384, 1848, 8856, 42724, 205660, 990076, 4760380, 22914572, 110251484, 530698540, 2553224764, 12288328268, 59125817692, 284558412524, 1369212514940, 6589395415436, 31707191199388, 152589046499116, 734250990732732

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 1 of A236035

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-2) +4*a(n-3) +192*a(n-4) +324*a(n-5) +696*a(n-6) +1808*a(n-7) +1312*a(n-8) +1152*a(n-9) +1024*a(n-10)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237843 A205737 A236035 * A233157 A237108 A237101

Adjacent sequences: A236025 A236026 A236027 * A236029 A236030 A236031

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2014

STATUS

approved