A166769 Number of nX5 1..2 arrays containing at least one of each value, and all equal values connected.

8, 90, 712, 4942, 32426, 206392, 1284728, 7855758, 47333834

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
...1.1.1.2.2...1.1.1.2.2...1.1.1.1.1...2.2.2.2.1...1.1.1.2.2...1.1.1.2.2
...1.1.1.1.2...1.2.2.2.1...1.2.1.1.1...2.2.1.1.1...1.2.1.1.2...1.1.1.1.2
...1.2.2.2.2...1.1.1.2.1...1.2.1.2.1...2.1.1.1.1...1.2.1.1.2...1.1.1.1.2
...1.1.1.1.2...1.1.1.1.1...1.2.2.2.2...2.2.2.2.2...1.2.2.2.2...1.1.1.1.1
------
...1.1.1.1.2...2.2.2.2.2...1.1.1.1.1...1.1.2.2.2...1.1.1.2.2...1.1.1.1.1
...2.2.2.1.2...1.1.1.1.2...2.2.2.2.1...1.2.2.2.2...1.1.1.1.2...1.2.1.1.1
...2.2.2.2.2...2.2.2.2.2...1.1.1.2.1...1.2.2.1.1...1.1.1.2.2...2.2.1.1.2
...2.2.2.2.2...2.2.2.2.2...1.1.1.1.1...1.1.1.1.1...1.1.1.2.2...2.2.2.2.2

Crossrefs

Sequence in context: A128304 A247728 A056784 * A323960 A187667 A331512

Adjacent sequences: A166766 A166767 A166768 * A166770 A166771 A166772

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved