A166775 Number of n X n 1..2 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.

0, 7, 44, 317, 3640, 78101

Offset

1,2

Links

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

Example

Some solutions for n=4
...1.1.1.1...2.1.1.1...2.1.1.1...1.1.1.1...2.1.1.1...1.1.1.1...2.1.1.1
...1.1.1.1...2.1.1.2...2.1.2.1...2.1.1.1...2.1.1.1...1.2.1.1...2.1.1.1
...1.1.1.1...2.1.1.2...2.1.2.1...2.2.2.1...2.1.1.1...2.2.2.1...2.1.1.1
...2.2.2.2...2.2.2.2...2.2.2.2...2.2.2.2...2.2.2.2...2.2.2.1...2.2.1.1
------
...1.1.1.1...2.2.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.2.2.2...2.1.1.1
...1.2.1.1...2.2.2.1...1.1.1.1...1.2.2.2...1.2.1.1...1.2.2.2...2.1.1.1
...2.2.2.1...2.2.2.1...1.2.1.1...2.2.2.2...1.2.2.1...1.2.2.2...2.2.1.2
...2.2.2.2...2.2.2.2...1.2.2.2...2.2.2.2...1.2.2.2...2.2.2.2...2.2.2.2

Crossrefs

Sequence in context: A391517 A093738 A091127 * A221541 A327680 A381046

Adjacent sequences: A166772 A166773 A166774 * A166776 A166777 A166778

Keyword

nonn

Author

R. H. Hardin, Oct 21 2009

Status

approved