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A164758
Number of nX6 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, 4 in the lower right corner, and with no element having more than 2 neighbors with the same value
0
83, 644, 2570, 6742, 13654, 24738
OFFSET
2,1
EXAMPLE
Some solutions for n=3
...1.1.3.3.2.2...1.1.1.1.2.2...1.1.3.3.2.2...1.2.2.2.2.2...1.1.1.1.2.2
...3.1.1.3.4.2...3.3.3.1.2.4...3.1.1.3.4.4...1.2.4.4.4.4...3.3.3.3.3.3
...3.3.3.3.4.4...3.4.4.4.4.4...3.3.3.3.4.4...3.3.3.3.3.4...3.4.4.4.4.4
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...1.1.1.1.2.2...1.1.1.1.2.2...1.1.1.1.1.2...1.2.2.2.2.2...1.3.3.4.2.2
...3.2.2.2.2.4...3.2.2.2.2.4...1.3.3.3.3.3...1.1.1.1.1.4...1.1.3.4.2.2
...3.3.3.4.4.4...3.3.3.3.4.4...3.3.4.4.4.4...3.3.4.4.4.4...3.3.3.4.4.4
CROSSREFS
Sequence in context: A232887 A232884 A142289 * A142751 A176633 A059236
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 24 2009
STATUS
approved