login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167257 Number of ways to partition an n X 8 grid into 4 connected equal-area regions 0
1, 25, 1038, 39731, 1596459 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3

...1.1.1.1.1.2.3.3...1.2.2.2.2.2.3.4...1.1.1.1.2.3.3.3...1.1.1.2.2.2.2.2

...1.4.2.2.2.2.2.3...1.1.2.3.3.3.3.4...1.2.2.2.2.4.4.3...1.3.1.2.4.4.4.4

...4.4.4.4.4.3.3.3...1.1.1.3.4.4.4.4...1.2.4.4.4.4.3.3...1.3.3.3.3.3.4.4

------

...1.2.2.2.2.3.3.3...1.2.2.2.3.3.3.3...1.1.1.2.2.3.3.3...1.2.2.3.3.3.3.3

...1.2.2.4.4.4.3.3...1.2.2.2.4.4.3.3...4.1.1.1.2.2.3.3...1.1.2.2.3.4.4.4

...1.1.1.1.4.4.4.3...1.1.1.1.4.4.4.4...4.4.4.4.4.2.2.3...1.1.1.2.2.4.4.4

------

...1.1.1.1.2.2.2.2...1.1.1.2.2.2.3.3...1.2.2.2.2.3.4.4...1.1.1.1.1.2.2.3

...1.3.1.4.4.4.4.2...1.2.2.2.3.3.3.3...1.2.2.3.3.3.3.4...1.4.4.4.2.2.3.3

...3.3.3.3.3.4.4.2...1.1.4.4.4.4.4.4...1.1.1.1.3.4.4.4...4.4.4.2.2.3.3.3

------

...1.1.2.2.3.4.4.4...1.1.2.3.3.3.3.3...1.1.1.1.2.2.3.3...1.1.2.2.3.4.4.4

...1.1.2.2.3.4.4.4...1.1.2.2.4.4.3.4...4.1.1.4.2.2.3.3...1.2.2.2.3.4.4.4

...1.1.2.2.3.3.3.3...1.1.2.2.2.4.4.4...4.4.4.4.2.2.3.3...1.1.1.2.3.3.3.3

CROSSREFS

Sequence in context: A218316 A232698 A139163 * A012692 A193121 A246923

Adjacent sequences:  A167254 A167255 A167256 * A167258 A167259 A167260

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 December 2 17:30 EST 2021. Contains 349445 sequences. (Running on oeis4.)