A166767 Number of n X 4 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: A350984 A281559 A386765 * A322889 A003298 A049869

Adjacent sequences: A166764 A166765 A166766 * A166768 A166769 A166770

Keyword

nonn,more

Author

R. H. Hardin, Oct 21 2009

Status

approved