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A254416 Number of (n+1)X(2+1) 0..2 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
470, 3279, 26783, 238639, 2182689, 20251190, 189197280, 1775014082, 16692481242, 157205933600, 1481804358552, 13974618847312, 131833559769176, 1243927351468696, 11738545341998160, 110780669523152824 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A254422
LINKS
FORMULA
Empirical: a(n) = 21*a(n-1) -139*a(n-2) +191*a(n-3) +1344*a(n-4) -4896*a(n-5) +1972*a(n-6) +10548*a(n-7) -8240*a(n-8) -8576*a(n-9) +4704*a(n-10) +3072*a(n-11) for n>17
EXAMPLE
Some solutions for n=3
..2..2..2....2..2..0....1..2..2....1..2..0....1..1..1....1..2..2....2..2..0
..0..2..1....0..2..0....0..2..2....2..2..0....2..2..2....1..2..2....1..2..2
..2..2..1....2..2..2....2..2..1....2..2..0....1..1..2....2..2..0....2..2..2
..0..0..1....2..2..2....0..2..2....2..1..2....1..0..2....0..1..1....0..0..1
CROSSREFS
Sequence in context: A251772 A253518 A254423 * A251771 A251152 A345535
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 30 2015
STATUS
approved

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Last modified April 20 11:40 EDT 2024. Contains 371838 sequences. (Running on oeis4.)