A166771 Number of nX6 1..2 arrays containing at least one of each value, and all equal values connected.

10, 132, 1618, 18584, 206392, 2247486

Offset

1,1

Links

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

Example

Some solutions for n=3
...1.1.1.1.1.2...2.2.2.2.2.1...2.2.2.2.2.2...2.2.2.2.1.1...2.2.2.2.2.2
...1.1.2.1.1.2...2.2.2.1.2.1...2.1.1.2.2.2...1.1.1.2.2.1...2.1.1.2.1.2
...2.2.2.2.2.2...2.2.2.1.1.1...1.1.1.1.1.1...1.1.1.1.1.1...2.2.1.1.1.2
------
...2.2.2.2.1.1...1.1.1.1.1.1...2.2.1.1.2.2...2.2.1.1.1.2...1.1.1.1.1.1
...2.2.2.2.1.1...1.1.1.1.1.1...2.2.2.2.2.2...2.1.1.1.1.2...1.1.1.2.2.2
...2.2.1.1.1.1...1.2.2.2.1.1...2.2.2.2.2.2...2.2.2.2.2.2...1.1.1.1.1.1

Crossrefs

Sequence in context: A284196 A286723 A239814 * A264279 A296637 A223407

Adjacent sequences: A166768 A166769 A166770 * A166772 A166773 A166774

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved