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A253750 Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically 1
450, 2723, 10182, 29737, 70590, 148134, 298760, 587522, 1126853, 2134789, 4034824, 7609993, 14320586, 26934197, 50677637, 95365268, 179465371, 337787639, 635898370, 1197229227, 2254216671, 4244626838, 7992870420, 15051425511 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A253749
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -10*a(n-2) +12*a(n-3) -9*a(n-4) -5*a(n-5) +25*a(n-6) -35*a(n-7) +33*a(n-8) -15*a(n-9) -15*a(n-10) +33*a(n-11) -35*a(n-12) +25*a(n-13) -5*a(n-14) -9*a(n-15) +12*a(n-16) -10*a(n-17) +5*a(n-18) -a(n-19) for n>25
EXAMPLE
Some solutions for n=4
..2..0..0..2..2....2..0..0..0..2....1..1..1..1..2....0..0..0..1..2
..1..1..2..1..0....2..1..0..1..1....1..1..1..2..2....2..2..2..1..2
..1..2..1..0..2....2..1..1..1..2....1..1..2..2..2....1..1..0..1..2
CROSSREFS
Sequence in context: A079659 A304511 A202197 * A253743 A253369 A253376
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 11 2015
STATUS
approved

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Last modified October 1 08:59 EDT 2023. Contains 365817 sequences. (Running on oeis4.)