A166763 Number of nX3 1..4 arrays containing at least one of each value, and all equal values connected.

0, 504, 10560, 103800, 671448, 3348840, 14014320, 51729072, 173858832, 543596760, 1605266976, 4526990088, 12293408616

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=3
...1.1.1...3.1.1...2.2.3...3.4.1...1.4.2...1.1.1...1.1.2...2.2.3...1.2.4
...2.4.1...1.1.4...1.2.3...3.4.1...1.2.2...1.1.2...4.1.1...1.4.3...1.1.1
...3.4.4...2.4.4...4.2.3...3.2.1...3.3.2...4.3.2...1.1.3...1.3.3...1.3.1
------
...3.3.3...1.2.2...2.1.1...3.3.1...4.4.4...4.4.4...3.3.2...2.3.3...3.3.3
...4.4.1...1.2.4...4.1.1...1.1.1...2.2.1...3.2.4...3.4.2...2.2.1...4.4.1
...2.1.1...3.3.4...3.3.3...4.2.2...2.3.1...3.2.1...3.4.1...4.2.2...4.2.1

Crossrefs

Sequence in context: A061124 A141145 A253724 * A012829 A013973 A218132

Adjacent sequences: A166760 A166761 A166762 * A166764 A166765 A166766

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved