A166787 Number of nX4 1..3 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.

18, 330, 2340, 11261, 42611, 136460, 385764, 988439

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
...2.2.2.2...2.2.1.1...1.1.2.2...2.1.3.3...2.2.2.2...2.1.1.1...2.2.2.2
...2.2.2.2...2.3.1.1...1.1.2.2...2.3.3.3...3.3.2.1...2.1.2.1...2.3.1.1
...3.3.2.1...2.3.3.1...3.1.1.1...3.3.3.3...3.3.2.1...2.2.2.3...3.3.3.3
------
...1.1.1.1...2.1.3.3...1.1.1.1...1.1.1.3...1.1.1.1...2.2.2.2...2.2.1.2
...1.2.1.3...3.3.3.3...1.1.1.3...2.1.1.3...3.2.1.1...3.2.1.1...2.2.2.2
...1.2.3.3...3.3.3.3...1.2.2.2...2.3.3.3...3.3.3.1...3.2.2.1...2.3.2.2

Crossrefs

Sequence in context: A041145 A041614 A222812 * A280806 A068771 A039646

Adjacent sequences: A166784 A166785 A166786 * A166788 A166789 A166790

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved