A166807 Number of nX4 1..4 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nondecreasing order.

1, 269, 3909, 29742, 160612, 694843, 2563636

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=3
...1.1.1.3...1.3.3.3...1.1.1.2...1.3.3.4...1.2.3.4...1.1.2.2...1.1.3.4
...2.4.4.3...1.3.3.4...1.2.2.2...2.3.4.4...1.2.3.4...1.2.2.3...1.3.3.4
...4.4.4.4...2.3.3.4...4.2.3.2...2.3.4.4...1.3.3.4...2.2.2.4...2.2.3.4
------
...1.1.4.4...1.1.2.2...1.2.2.2...1.1.1.4...1.4.4.4...1.1.1.3...2.2.2.3
...1.2.2.2...1.4.2.3...2.2.4.4...1.3.4.4...2.2.3.4...1.1.2.3...2.4.4.4
...1.3.3.3...2.2.2.3...2.3.3.3...3.3.2.2...2.2.4.4...2.2.2.4...4.4.4.1

Crossrefs

Sequence in context: A059330 A054803 A251216 * A131264 A053322 A274328

Adjacent sequences: A166804 A166805 A166806 * A166808 A166809 A166810

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved