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A236517
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 columnwise and nonincreasing rowwise.
1
52, 264, 1256, 5670, 25023, 108214, 462970, 1962897, 8278491, 34768983, 145652451, 608974557, 2542990472, 10609555831, 44237987228, 184378860260, 768258530698, 3200511193171, 13331394907045, 55525565937033, 231251505598612
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OFFSET
1,1
COMMENTS
Column 2 of
A236523
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) -75*a(n-3) +168*a(n-4) +171*a(n-5) -664*a(n-6) +28*a(n-7) +1000*a(n-8) -411*a(n-9) -606*a(n-10) +337*a(n-11) +151*a(n-12) -94*a(n-13) -12*a(n-14) +8*a(n-15)
EXAMPLE
Some solutions for n=4
..0..0..0....0..0..1....1..0..1....0..1..0....0..1..1....1..1..1....0..1..0
..1..0..0....0..0..1....1..1..0....0..1..1....1..0..1....1..0..1....1..1..1
..0..0..1....0..0..1....0..1..0....1..0..1....0..0..0....0..1..1....1..1..0
..1..0..0....1..0..1....1..1..1....1..1..1....0..0..0....1..0..0....1..1..1
..0..0..0....0..0..1....1..0..0....1..1..1....0..1..0....0..1..1....1..1..1
CROSSREFS
Sequence in context:
A122239
A086860
A070147
*
A320556
A252335
A230533
Adjacent sequences:
A236514
A236515
A236516
*
A236518
A236519
A236520
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 27 2014
STATUS
approved
