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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

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

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: A206090 A071144 A204417 * A204409 A152217 A004932

Adjacent sequences:  A204407 A204408 A204409 * A204411 A204412 A204413

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified October 16 23:30 EDT 2019. Contains 328103 sequences. (Running on oeis4.)