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A235819 Number of (2+1)X(n+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise 1
2894, 87888, 2287822, 52447112, 1113883030, 22196597522, 422920594570, 7766100008976, 138645436041864, 2418329907871922, 41404091421401562, 697988478843485434, 11617489583931774864, 191301863229644130672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A235818

LINKS

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

EXAMPLE

Some solutions for n=2

..2..1..3....0..1..0....1..0..3....2..2..3....0..3..0....3..3..3....1..3..3

..2..0..3....2..3..3....0..2..3....1..1..0....2..1..2....2..1..1....3..2..1

..2..1..0....3..2..3....2..2..2....1..1..3....3..1..2....2..2..2....2..2..0

CROSSREFS

Sequence in context: A205051 A262418 A235816 * A235575 A281657 A234886

Adjacent sequences:  A235816 A235817 A235818 * A235820 A235821 A235822

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 16 2014

STATUS

approved

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Last modified August 10 16:03 EDT 2022. Contains 356039 sequences. (Running on oeis4.)