A185431 Number of (n+2)X7 0..7 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

4370405405266, 1297535366114472, 209290512833668811, 22687513754718781985, 1812817799965228636502, 112849363355150447528536, 5686283998453160141912882, 238618763396476742696570337

Offset

1,1

Comments

Column 5 of A185435

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for 4X7
..0..0..0..0..0..0..1....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..2....0..0..0..0..0..0..2....0..0..0..0..0..1..5
..0..0..0..0..0..3..1....0..0..0..0..0..1..2....0..0..0..0..0..4..0
..0..0..0..0..0..6..2....0..0..0..0..0..2..4....0..0..0..0..0..4..7

Crossrefs

Sequence in context: A288284 A233504 A013640 * A139574 A233625 A237361

Adjacent sequences: A185428 A185429 A185430 * A185432 A185433 A185434

Keyword

nonn

Author

R. H. Hardin Jan 27 2011

Status

approved