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A235654 Number of (n+1)X(2+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise 1
52, 276, 1368, 6378, 28823, 126926, 550175, 2355552, 10004536, 42235174, 177579946, 744429835, 3114442287, 13010940991, 54301263895, 226468945249, 944063980856, 3934142359952, 16390818551843, 68278377411075 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235660

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -20*a(n-2) -97*a(n-3) +393*a(n-4) +130*a(n-5) -2190*a(n-6) +1313*a(n-7) +5707*a(n-8) -6006*a(n-9) -7785*a(n-10) +10983*a(n-11) +5679*a(n-12) -10491*a(n-13) -2203*a(n-14) +5639*a(n-15) +424*a(n-16) -1701*a(n-17) -32*a(n-18) +264*a(n-19) -16*a(n-21)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A320556 A252335 A230533 * A118328 A079414 A270769

Adjacent sequences:  A235651 A235652 A235653 * A235655 A235656 A235657

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2014

STATUS

approved

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Last modified April 14 07:59 EDT 2021. Contains 342946 sequences. (Running on oeis4.)