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A254423 Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
470, 3279, 25589, 229652, 2128339, 19879926, 186426904, 1752614398, 16501742450, 155519360130, 1466527601250, 13834051837650, 130527440933858, 1231716994177714, 11623968878478050, 109703076280582962 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 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>18
EXAMPLE
Some solutions for n=3
..0..0..1..2....0..1..2..1....2..2..2..0....0..1..2..0....1..2..1..2
..1..1..1..2....0..0..2..0....2..2..2..2....0..1..2..0....2..2..2..2
..0..0..1..2....0..0..2..2....2..2..2..1....2..2..2..1....2..0..1..0
CROSSREFS
Sequence in context: A251779 A251772 A253518 * A254416 A251771 A251152
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 30 2015
STATUS
approved

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Last modified April 21 03:36 EDT 2024. Contains 371850 sequences. (Running on oeis4.)