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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

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)