A204414 Number of (n+2)X7 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way

22956524, 52039032, 49914501, 89459577, 253954944, 1364559057, 8802512928, 94119917760, 799779768057, 5157529409520, 54442875220704, 461709627045696, 2975903003844864, 31413452974221312, 266406358593250368

Offset

1,1

Comments

Column 5 of A204417

Links

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

Formula

Empirical: a(n) = 577*a(n-3) for n>16

Example

Some solutions for n=3
..0..0..2..2..2..0..2....2..0..1..1..0..0..1....1..0..0..1..1..0..0
..1..0..1..2..0..1..0....2..1..0..1..1..0..1....0..1..1..0..1..1..0
..2..0..0..1..2..2..1....0..2..1..0..2..1..1....2..0..2..1..0..2..1
..0..1..2..0..1..2..2....0..2..2..1..1..2..1....0..1..2..2..1..1..2
..2..0..1..2..0..1..2....0..1..2..2..0..1..2....1..0..1..2..2..0..0

Crossrefs

Sequence in context: A238154 A069377 A235931 * A114666 A157079 A321065

Adjacent sequences: A204411 A204412 A204413 * A204415 A204416 A204417

Keyword

nonn

Author

R. H. Hardin Jan 15 2012

Status

approved