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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167250 Number of ways to partition a 2*n X 4 grid into 8 connected equal-area regions 0
1, 36, 939, 40899, 890989, 25878086, 543568577 (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

...1.2.3.3...1.1.2.3...1.2.2.3...1.2.2.2...1.2.3.3...1.1.2.2...1.1.2.2

...1.2.4.3...4.1.2.3...1.1.2.3...1.3.3.4...1.2.4.3...1.3.2.4...3.1.2.4

...1.2.4.4...4.5.2.3...4.5.5.3...1.3.4.4...1.2.4.4...3.3.4.4...3.3.4.4

...5.5.5.6...4.5.6.7...4.5.6.6...5.6.6.7...5.6.6.7...5.6.7.7...5.5.5.6

...7.8.8.6...8.5.6.7...4.7.6.8...5.6.8.7...5.6.8.7...5.6.8.7...7.7.7.6

...7.7.8.6...8.8.6.7...7.7.8.8...5.8.8.7...5.8.8.7...5.6.8.8...8.8.8.6

------

...1.1.2.3...1.2.2.3...1.2.2.3...1.2.3.3...1.2.3.3...1.1.2.2...1.2.3.4

...1.2.2.3...1.4.2.3...1.1.2.3...1.2.2.3...1.2.4.3...3.1.2.4...1.2.3.4

...4.4.4.3...1.4.4.3...4.4.4.3...1.4.4.4...1.2.4.4...3.5.4.4...1.2.3.4

...5.6.6.7...5.6.6.6...5.5.5.6...5.5.5.6...5.6.7.7...3.5.5.6...5.5.6.6

...5.5.6.7...5.7.8.8...7.7.6.6...7.7.6.6...5.6.6.7...7.8.8.6...5.7.8.6

...8.8.8.7...5.7.7.8...7.8.8.8...7.8.8.8...5.8.8.8...7.7.8.6...7.7.8.8

CROSSREFS

Sequence in context: A075916 A062150 A011811 * A218177 A107398 A053111

Adjacent sequences:  A167247 A167248 A167249 * A167251 A167252 A167253

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 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 July 20 22:20 EDT 2019. Contains 325189 sequences. (Running on oeis4.)