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A235839 Number of (n+1)X(2+1) 0..2 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise 1
487, 6921, 86509, 919222, 8638740, 73276865, 573836909, 4209526173, 29315012106, 195567636675, 1260793028680, 7902333022413, 48450753346164, 291857672487975, 1735081638204069, 10213231916866375, 59720608313178454, 347726532976693642 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235842

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A142858 A255207 A236424 * A203873 A097766 A214806

Adjacent sequences:  A235836 A235837 A235838 * A235840 A235841 A235842

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 16 2014

STATUS

approved

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Last modified January 22 07:39 EST 2020. Contains 331139 sequences. (Running on oeis4.)