A166772 Number of nX6 1..3 arrays containing at least one of each value, and all equal values connected.

60, 3780, 108456, 2247456, 38813010

Offset

1,1

Links

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

Example

Some solutions for n=3
...3.3.1.2.2.2...1.1.1.1.1.1...2.3.3.3.1.1...2.2.3.3.3.3...1.1.1.1.1.3
...3.1.1.1.1.1...1.1.1.3.1.1...2.2.2.3.1.1...1.1.1.3.3.3...2.1.1.1.3.3
...3.3.3.3.1.1...1.2.2.2.2.1...2.2.2.1.1.1...1.3.3.3.3.3...2.2.2.1.3.3
------
...3.3.3.3.2.2...1.2.2.2.2.3...1.1.1.1.3.3...3.3.3.1.1.1...1.2.2.2.2.2
...3.3.1.3.2.2...1.1.2.3.3.3...2.1.2.1.3.2...3.2.3.1.2.1...2.2.2.3.3.2
...3.1.1.3.3.2...2.2.2.2.2.2...2.2.2.2.2.2...3.2.2.2.2.2...2.2.2.3.3.3

Crossrefs

Sequence in context: A267977 A159991 A042741 * A293091 A074076 A084274

Adjacent sequences: A166769 A166770 A166771 * A166773 A166774 A166775

Keyword

nonn

Author

R. H. Hardin, Oct 21 2009

Status

approved