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

3570, 154938, 947990, 11785518, 253954944, 2050960896, 27153833472, 585112190976, 4725413904384, 62562432319488, 1348098488008704, 10887353635700736, 144143844064100352, 3106018916372054016

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