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A235567 Number of (n+1)X(2+1) 0..1 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise 1
50, 250, 1120, 4670, 18606, 71710, 270016, 998834, 3646406, 13176346, 47242048, 168350870, 597109486, 2110060262, 7435237264, 26141362890, 91751051238, 321596169218, 1126053324976, 3939647403086, 13774810332334, 48139938720622 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235573

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -19*a(n-2) -47*a(n-3) +211*a(n-4) -45*a(n-5) -665*a(n-6) +643*a(n-7) +714*a(n-8) -1200*a(n-9) +16*a(n-10) +640*a(n-11) -256*a(n-12)

EXAMPLE

Some solutions for n=5

..1..1..1....0..0..0....1..1..0....1..1..1....0..1..0....1..0..0....0..1..1

..1..1..0....0..0..1....1..1..0....0..1..1....1..1..1....1..1..0....1..1..1

..0..1..1....1..0..0....0..1..0....1..1..0....1..1..1....1..0..0....1..0..0

..1..1..1....1..1..0....1..1..0....0..1..0....1..0..1....0..0..0....1..0..0

..1..0..1....1..1..1....1..1..0....1..0..0....1..1..1....1..0..0....0..1..0

..0..0..1....0..1..1....0..0..0....1..0..0....1..1..1....1..1..1....1..0..1

CROSSREFS

Sequence in context: A231087 A235956 A197971 * A091883 A091414 A186123

Adjacent sequences:  A235564 A235565 A235566 * A235568 A235569 A235570

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2014

STATUS

approved

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Last modified December 5 08:36 EST 2021. Contains 349543 sequences. (Running on oeis4.)