A164751 Number of nX5 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner

96, 3576, 66970, 920072, 10521134, 106357664, 983760734, 8508516160, 69824478502

Offset

2,1

Links

Table of n, a(n) for n=2..10.

Example

Some solutions for n=3
...1.1.2.2.2...1.1.1.2.2...1.2.2.2.2...1.1.1.4.2...1.1.1.2.2...1.1.2.2.2
...2.2.2.2.4...4.4.4.4.2...1.3.2.2.2...1.3.3.4.4...3.1.1.4.2...3.1.1.4.2
...3.2.2.2.4...3.4.4.4.4...3.3.4.4.4...3.3.3.4.4...3.3.1.4.4...3.1.4.4.4
------
...1.1.2.2.2...1.3.4.2.2...1.3.3.2.2...1.1.3.2.2...1.1.1.2.2...1.1.3.2.2
...1.1.1.1.4...1.3.4.4.2...1.3.4.4.4...3.1.3.3.2...1.1.1.2.2...1.1.3.4.4
...3.3.4.4.4...3.3.3.4.4...3.3.3.3.4...3.3.3.3.4...3.1.1.2.4...3.3.3.3.4

Crossrefs

Sequence in context: A164762 A282210 A008660 * A272765 A240445 A229458

Adjacent sequences: A164748 A164749 A164750 * A164752 A164753 A164754

Keyword

nonn

Author

R. H. Hardin Aug 24 2009

Status

approved