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A164748 Number of n X n 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 0
1, 108, 8181, 920072, 204261981 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..6.

EXAMPLE

Some solutions for n=4

...1.1.1.2...1.4.2.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.1.2...1.1.1.2

...1.3.3.3...1.4.4.4...1.1.1.1...1.1.2.2...4.2.2.2...3.3.1.4...1.1.2.2

...3.3.3.3...1.1.4.4...3.1.3.4...3.2.2.2...4.4.4.2...3.4.4.4...2.2.2.4

...3.4.4.4...3.3.4.4...3.3.3.4...3.3.4.4...3.4.4.4...3.4.4.4...3.3.2.4

------

...1.4.2.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.4.2...1.3.2.2...1.1.1.2

...4.4.4.4...3.1.1.1...1.1.1.4...1.4.4.4...4.4.4.2...3.3.2.2...1.1.1.1

...3.3.3.4...3.3.1.4...3.1.4.4...3.4.3.4...4.4.4.4...3.3.3.3...1.3.4.4

...3.3.3.4...3.3.3.4...3.3.3.4...3.3.3.4...3.3.3.4...3.3.4.4...3.3.4.4

CROSSREFS

Sequence in context: A299857 A132053 A273439 * A269093 A113853 A209043

Adjacent sequences: A164745 A164746 A164747 * A164749 A164750 A164751

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 24 2009

STATUS

approved

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Last modified December 1 01:13 EST 2022. Contains 358453 sequences. (Running on oeis4.)