A204416 Number of (n+2)X9 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way

2004465237, 2826265830, 3619976949, 6016853259, 8802512928, 13168291392, 27153833472, 206114865408, 2587131767808, 13862829908736, 122134679546112, 1514872207710720, 8036997091598592, 70505197603909632, 874092505119473664

Offset

1,1

Comments

Column 7 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>18

Example

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

Crossrefs

Sequence in context: A232129 A251506 A259349 * A335839 A195225 A172706

Adjacent sequences: A204413 A204414 A204415 * A204417 A204418 A204419

Keyword

nonn

Author

R. H. Hardin Jan 15 2012

Status

approved