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A235557 Number of (n+1)X(2+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise 1
2612, 86742, 2481481, 58495571, 1190247008, 21374536916, 348532234129, 5242478364024, 73916754634539, 986934451901485, 12602732098597039, 154990682101091470, 1848012177784521785, 21472048623026034484 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235559

LINKS

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

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A236666 A252341 A235777 * A257427 A257420 A254236

Adjacent sequences:  A235554 A235555 A235556 * A235558 A235559 A235560

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2014

STATUS

approved

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Last modified May 27 15:52 EDT 2022. Contains 354107 sequences. (Running on oeis4.)