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A164757 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, 4 in the lower right corner, and with no element having more than 2 neighbors with the same value +0
1
50, 480, 1538, 3496, 6742, 10476, 14432, 18120, 21386 (list; graph; listen)
OFFSET

2,1

EXAMPLE

Some solutions for n=3

...1.1.1.2.2...1.4.4.2.2...1.1.1.1.2...1.1.2.2.2...1.1.1.3.2...1.1.2.2.2

...1.3.3.2.2...3.3.4.2.4...1.3.3.1.1...3.2.2.3.2...1.3.3.3.2...3.1.1.1.1

...3.3.4.4.4...3.3.4.4.4...3.3.4.4.4...3.3.3.3.4...3.3.4.4.4...3.3.3.3.4

------

...1.4.2.2.2...1.1.2.2.2...1.1.3.2.2...1.1.1.2.2...1.1.1.1.2...1.1.3.2.2

...3.4.4.4.2...1.1.2.4.4...1.3.3.2.4...3.3.3.2.4...1.2.2.2.2...3.1.3.2.2

...3.3.3.4.4...3.3.2.2.4...3.3.4.4.4...3.2.2.2.4...3.2.4.4.4...3.3.3.4.4

CROSSREFS

Sequence in context: A031420 A111341 A019561 this_sequence A128954 A022147 A160336

Adjacent sequences: A164754 A164755 A164756 this_sequence A164758 A164759 A164760

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Aug 24 2009

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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