login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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. 0
1, 269, 3909, 29742, 160612, 694843, 2563636 (list; graph; refs; listen; history; text; internal format)
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

------

...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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 15 01:15 EST 2019. Contains 329142 sequences. (Running on oeis4.)