2,1

R. H. Hardin, Table of n, a(n) for n=2..22

Some solutions for n=4

...1.1.2.2.........1.1.4.2.........1.1.2.2.........1.1.2.2......

.....1.3.2.2.........4.4.4.4.........1.3.3.3.........1.2.2.2....

.......3.3.2.2.........4.3.4.4.........3.3.3.3.........3.3.2.2..

.........3.3.3.4.........3.3.4.4.........3.3.4.4.........3.2.2.4

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...1.1.2.2.........1.1.1.2.........1.2.2.2.........1.1.2.2......

.....1.1.2.2.........1.2.2.2.........2.2.2.2.........1.1.2.1....

.......1.1.2.4.........3.3.4.4.........3.3.4.4.........1.1.1.1..

.........3.4.4.4.........3.3.4.4.........3.4.4.4.........3.3.4.4

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...1.1.1.2.........1.1.1.2.........1.1.2.2.........1.1.2.2......

.....1.1.3.3.........2.2.2.2.........2.2.4.4.........3.3.2.2....

.......1.3.4.4.........2.2.2.4.........2.2.4.4.........3.3.2.2..

.........3.3.4.4.........3.4.4.4.........3.4.4.4.........3.3.4.4

Sequence in context: A007619 A163212 A163154 this_sequence A156848 A057016 A083252

Adjacent sequences: A165384 A165385 A165386 this_sequence A165388 A165389 A165390

nonn

Ron Hardin (rhhardin(AT)att.net) Sep 17 2009