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A236424 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 columnwise and nonincreasing rowwise 1
487, 5772, 60193, 544380, 4505522, 34394854, 247470127, 1692391516, 11125768607, 70778574186, 438808934095, 2664649821781, 15926647839729, 94055397322922, 550759978627494, 3206878777142928, 18613731789595410, 107906959499841906 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236427

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A048424 A142858 A255207 * A235839 A203873 A097766

Adjacent sequences:  A236421 A236422 A236423 * A236425 A236426 A236427

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 25 2014

STATUS

approved

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Last modified January 27 09:01 EST 2020. Contains 331293 sequences. (Running on oeis4.)