A166807 - OEIS

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A166807

Number of nX4 1..4 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nondecreasing order.

1, 269, 3909, 29742, 160612, 694843, 2563636

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

...1.1.1.3...1.3.3.3...1.1.1.2...1.3.3.4...1.2.3.4...1.1.2.2...1.1.3.4

...2.4.4.3...1.3.3.4...1.2.2.2...2.3.4.4...1.2.3.4...1.2.2.3...1.3.3.4

...4.4.4.4...2.3.3.4...4.2.3.2...2.3.4.4...1.3.3.4...2.2.2.4...2.2.3.4

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...1.1.4.4...1.1.2.2...1.2.2.2...1.1.1.4...1.4.4.4...1.1.1.3...2.2.2.3

...1.2.2.2...1.4.2.3...2.2.4.4...1.3.4.4...2.2.3.4...1.1.2.3...2.4.4.4

...1.3.3.3...2.2.2.3...2.3.3.3...3.3.2.2...2.2.4.4...2.2.2.4...4.4.4.1

CROSSREFS

Sequence in context: A059330 A054803 A251216 * A131264 A053322 A274328

Adjacent sequences: A166804 A166805 A166806 * A166808 A166809 A166810

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 21 2009

STATUS

approved