A166835 Number of nX4 1..3 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 nonincreasing order.

3, 69, 419, 1726, 5770, 16740, 43595, 104045, 230887, 481629

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
...3.3.1.1...2.2.2.1...2.1.1.1...1.1.1.1...2.2.1.1...2.1.1.1...2.2.1.1
...3.3.2.1...3.2.2.1...2.2.1.1...3.2.2.1...2.2.1.1...2.2.2.1...2.2.1.1
...3.3.2.1...3.2.2.1...3.1.1.1...3.3.2.1...3.1.1.1...3.2.1.1...2.2.2.2
...3.3.2.1...3.3.3.3...3.3.3.3...3.3.2.2...3.3.3.3...3.2.2.1...3.2.2.2
------
...2.2.2.2...3.3.2.1...2.2.1.1...2.2.2.2...2.2.2.1...2.1.1.1...2.2.2.1
...2.2.2.2...3.3.2.2...3.2.2.2...3.2.2.1...2.2.2.1...2.2.1.1...2.2.2.1
...3.2.2.1...3.3.2.2...3.2.3.2...3.3.1.1...2.2.2.2...3.3.1.1...3.3.2.2
...3.3.2.2...3.3.3.2...3.3.3.3...3.3.1.1...3.2.2.2...3.3.3.1...3.3.3.3

Crossrefs

Sequence in context: A232326 A270869 A241222 * A166806 A219070 A086223

Adjacent sequences: A166832 A166833 A166834 * A166836 A166837 A166838

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved