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A223994 Number of nX3 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing 1
10, 76, 476, 2980, 18672, 117386, 739672, 4664776, 29428242, 185670484, 1171477424, 7391425016, 46636189140, 294251036912, 1856576835280, 11714070469768, 73909919072136, 466334575535548, 2942337620960936 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A223999

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -24*a(n-2) -2*a(n-3) +30*a(n-4) +96*a(n-5) -150*a(n-6) -108*a(n-7) +48*a(n-8) +270*a(n-9)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A136869 A108277 A061319 * A016149 A081199 A198692

Adjacent sequences:  A223991 A223992 A223993 * A223995 A223996 A223997

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

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Last modified October 28 16:41 EDT 2021. Contains 348329 sequences. (Running on oeis4.)