A204500 Number of (n+2)X9 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically.

8067170432, 66134172894, 379274173335, 3197724403266, 23772717607473, 286595565957180, 2150256810788631, 21212674520269086, 420794716153646061, 3180342417115503879, 27970972276407996771, 482602507408771603245

Offset

1,1

Comments

Column 7 of A204501

Links

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

Example

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

Crossrefs

Sequence in context: A075131 A250865 A108880 * A290539 A017003 A017075

Adjacent sequences: A204497 A204498 A204499 * A204501 A204502 A204503

Keyword

nonn

Author

R. H. Hardin, Jan 15 2012

Status

approved