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A204409 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way 1
3570, 154938, 947990, 11785518, 253954944, 2050960896, 27153833472, 585112190976, 4725413904384, 62562432319488, 1348098488008704, 10887353635700736, 144143844064100352, 3106018916372054016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204417

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A071144 A204417 A204410 * A152217 A004932 A004952

Adjacent sequences:  A204406 A204407 A204408 * A204410 A204411 A204412

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified September 15 22:10 EDT 2019. Contains 327088 sequences. (Running on oeis4.)