A166768 Number of n X 4 1..4 arrays containing at least one of each value, and all equal values connected.

24, 3672, 103800, 1505784, 15094248, 120002640

Offset

1,1

Links

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

Example

Some solutions for n=3
...1.1.1.1...2.4.4.1...2.2.2.3...4.1.2.2...1.1.2.4...1.4.4.3...4.1.1.1
...3.2.3.4...2.4.4.3...1.1.1.1...4.3.3.2...3.3.2.4...1.1.4.4...4.1.2.3
...3.3.3.3...3.3.3.3...4.1.1.1...2.2.2.2...3.3.3.4...2.2.2.2...2.2.2.2
------
...3.3.3.1...2.2.1.4...2.2.4.4...3.3.3.2...3.4.1.4...2.1.3.2...4.3.3.3
...3.2.3.1...2.1.1.3...3.3.3.3...1.4.3.3...4.4.4.4...2.1.4.2...2.1.3.3
...2.2.2.4...2.3.3.3...3.1.1.1...1.3.3.3...4.4.2.2...2.2.2.2...1.1.1.1

Crossrefs

Sequence in context: A223123 A278651 A357266 * A326120 A159399 A184687

Adjacent sequences: A166765 A166766 A166767 * A166769 A166770 A166771

Keyword

nonn,more

Author

R. H. Hardin Oct 21 2009

Status

approved