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A224348 Number of nX3 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
10, 100, 788, 5880, 45064, 349280, 2710892, 21021916, 163012744, 1264202660, 9804721360, 76042111360, 589756075600, 4573942739248, 35473931052816, 275123688202096, 2133765358334352, 16548755248130912, 128346493442546640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A224353

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -16*a(n-2) -24*a(n-3) +164*a(n-4) -516*a(n-5) +140*a(n-6) +956*a(n-7) -1500*a(n-8) +3180*a(n-9) +60*a(n-10)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A223865 A293890 A218269 * A213298 A224007 A136876

Adjacent sequences:  A224345 A224346 A224347 * A224349 A224350 A224351

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 04 2013

STATUS

approved

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Last modified January 26 05:10 EST 2020. Contains 331273 sequences. (Running on oeis4.)