A166755 Number of n X n 1..2 arrays containing at least one of each value, and all equal values connected.

0, 12, 106, 1254, 32426, 2247486

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
...1.2.2.2...1.1.1.1...2.2.2.1...2.1.1.1...1.1.1.1...2.2.2.2...1.1.1.2
...1.2.1.2...2.2.2.1...2.2.2.1...2.2.1.1...1.1.2.2...1.2.2.2...2.2.1.2
...1.1.1.2...2.2.2.1...2.2.1.1...1.1.1.1...1.1.2.2...2.2.2.2...2.1.1.2
...2.2.2.2...2.1.1.1...2.2.2.2...1.1.1.1...2.2.2.2...2.2.2.2...2.2.2.2
------
...1.1.1.2...2.1.1.1...2.2.2.2...1.1.1.1...1.1.1.1...1.1.1.1...2.2.2.2
...1.1.2.2...2.1.1.1...2.2.1.2...1.1.1.1...2.2.1.1...1.2.1.2...1.2.2.2
...1.1.1.2...2.2.1.1...2.2.1.2...1.1.2.1...1.2.1.1...1.2.2.2...1.1.2.2
...1.1.2.2...2.2.2.2...2.1.1.1...2.2.2.1...1.1.1.1...1.1.1.2...1.1.1.2

Crossrefs

Sequence in context: A144133 A089396 A218111 * A230712 A271559 A154671

Adjacent sequences: A166752 A166753 A166754 * A166756 A166757 A166758

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved