A166773 Number of nX7 1..2 arrays containing at least one of each value, and all equal values connected.

12, 182, 3518, 67756, 1284728

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=3
...2.2.2.2.2.2.1...2.2.2.1.1.1.1...2.2.2.2.2.2.2...2.2.2.2.2.2.2
...2.2.2.1.1.1.1...2.2.2.1.1.1.1...2.2.2.2.1.2.2...1.1.2.2.1.2.1
...2.2.1.1.1.1.1...2.2.1.1.1.1.1...2.2.1.1.1.2.2...1.1.1.1.1.1.1
------
...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.1.1
...2.2.1.2.1.1.2...2.1.1.2.2.2.2...2.1.1.1.1.2.2...1.2.1.1.1.1.1
...2.1.1.1.1.1.1...1.1.1.1.1.1.2...1.1.1.1.1.1.2...1.1.1.1.1.1.1

Crossrefs

Sequence in context: A145560 A332960 A230345 * A202632 A285410 A218886

Adjacent sequences: A166770 A166771 A166772 * A166774 A166775 A166776

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved