A166767 Number of nX4 1..3 arrays containing at least one of each value, and all equal values connected.

18, 642, 8100, 64980, 410832, 2247456, 11162262, 51747942, 227868462

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
...3.3.3.3...3.1.2.2...2.1.3.3...2.2.2.2...3.2.2.2...3.3.3.2...2.2.2.2
...3.3.3.3...3.3.2.2...2.3.3.3...1.2.2.3...3.2.1.2...3.1.3.3...2.2.3.1
...1.2.2.3...3.3.3.2...3.3.3.3...1.1.1.1...2.2.1.1...1.1.3.3...2.2.3.1
------
...3.3.2.2...1.1.2.2...3.2.2.1...1.1.3.3...2.3.3.3...1.1.3.3...1.1.2.2
...3.3.1.2...1.2.2.2...3.1.1.1...1.3.3.3...2.3.3.1...1.3.3.3...1.2.2.2
...3.3.3.3...2.2.3.2...3.1.1.1...1.1.2.3...2.2.3.3...3.3.2.2...1.1.2.3

Crossrefs

Sequence in context: A295369 A350984 A281559 * A322889 A003298 A049869

Adjacent sequences: A166764 A166765 A166766 * A166768 A166769 A166770

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved