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A204410 Number of (n+2)X3 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way 1
3570, 34274, 423416, 2827014, 22956524, 254913953, 2004465237, 15823989959, 158617650347, 1353760999548, 10882251716483, 101546847836300, 896170921039248, 7402363549559927, 66263141456682440, 589539403432471731 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A204417
LINKS
FORMULA
Empirical: a(n) = 460*a(n-3) +1362*a(n-4) +2847*a(n-5) +2179*a(n-6) +26106*a(n-7) +51165*a(n-8) +60758*a(n-9) -30501*a(n-10) -91290*a(n-11) -24768*a(n-12) +6156*a(n-13) +36936*a(n-14)
EXAMPLE
Some solutions for n=3
..2..1..0....2..1..2....1..1..1....0..1..1....2..0..1....2..2..0....0..0..0
..2..1..2....1..0..2....2..1..1....0..0..1....2..0..2....1..2..0....2..0..0
..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..0..2..0....0..0..2....2..1..2....1..0..1....1..0..2....1..2..0....0..0..2
..0..2..0....2..2..0....2..1..0....1..2..1....1..0..2....0..2..1....0..0..0
CROSSREFS
Sequence in context: A357590 A071144 A204417 * A204409 A152217 A004932
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2012
STATUS
approved

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Last modified March 28 13:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)