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A235840 Number of (n+1)X(3+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
2581, 86509, 2919508, 84434218, 2090202044, 44724089619, 849474770590, 14522792725086, 227945075932922, 3310579596663058, 45097735688257706, 578891366979555783, 7068001519607692033, 82341095995180796862 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235842

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..177

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A252167 A252160 A236425 * A200711 A235950 A260840

Adjacent sequences:  A235837 A235838 A235839 * A235841 A235842 A235843

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 16 2014

STATUS

approved

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Last modified June 26 21:14 EDT 2022. Contains 354885 sequences. (Running on oeis4.)