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A204604 Number of (n+2)X7 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally, vertically or nw-to-se diagonally exactly one way 1
16247580, 40672735, 43980907, 69792825, 207096000, 1139760144, 6656676736, 61015724528, 513802492708, 3004591151584, 27074363705888, 227330083011172, 1328325507137504, 11969420064914272, 100501902404767796 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A204607

LINKS

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

FORMULA

Empirical: a(n) = 442*a(n-3) +43*a(n-6) for n>16

EXAMPLE

Some solutions for n=3

..2..0..2..0..0..0..2....2..1..0..2..1..0..1....2..2..2..0..2..1..0

..0..2..2..1..0..1..0....1..2..1..0..1..1..0....1..2..2..1..0..2..1

..0..1..2..2..1..0..2....0..2..2..1..0..2..1....0..1..2..2..1..0..2

..1..0..1..2..2..1..2....0..1..2..2..1..1..2....1..0..1..2..2..1..2

..0..2..0..1..2..2..2....0..0..1..2..2..0..1....0..0..0..1..2..2..1

CROSSREFS

Sequence in context: A179585 A105650 A234457 * A253716 A216004 A155949

Adjacent sequences:  A204601 A204602 A204603 * A204605 A204606 A204607

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2012

STATUS

approved

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Last modified February 26 17:03 EST 2021. Contains 341632 sequences. (Running on oeis4.)