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A167255 Number of ways to partition an n X 7 grid into 7 connected equal-area regions 1
1, 21, 441, 9157, 214689, 5850115, 158753814, 4292655082 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

...1.1.1.2.3.3.3...1.2.2.2.3.3.4...1.1.1.1.2.2.3...1.2.2.2.2.3.4

...1.4.4.2.2.5.3...1.2.5.5.5.3.4...4.4.4.4.5.2.3...1.5.6.6.3.3.4

...6.6.4.4.2.5.5...1.6.6.6.5.3.4...6.7.7.7.5.2.3...1.5.6.6.7.3.4

...6.6.7.7.7.7.5...1.6.7.7.7.7.4...6.6.6.7.5.5.3...1.5.5.7.7.7.4

------

...1.1.1.1.2.2.3...1.2.2.3.4.4.4...1.2.3.3.3.4.4...1.1.2.2.2.3.3

...4.4.5.2.2.6.3...1.1.2.3.3.4.5...1.2.2.3.5.4.4...4.1.5.2.6.7.3

...4.5.5.5.6.6.3...6.1.2.3.7.5.5...1.2.6.6.5.7.7...4.1.5.6.6.7.3

...4.7.7.7.7.6.3...6.6.6.7.7.7.5...1.6.6.5.5.7.7...4.4.5.5.6.7.7

------

...1.1.1.2.3.4.4...1.1.1.1.2.3.3...1.2.2.3.4.5.5...1.1.1.2.2.3.3

...5.1.2.2.3.6.4...4.4.2.2.2.5.3...1.2.2.3.4.5.5...1.4.2.2.5.5.3

...5.5.5.2.3.6.4...4.6.6.6.6.5.3...1.1.6.3.4.7.7...6.4.4.4.5.5.3

...7.7.7.7.3.6.6...4.7.7.7.7.5.5...6.6.6.3.4.7.7...6.6.6.7.7.7.7

CROSSREFS

Sequence in context: A207184 A189060 A224009 * A171295 A009965 A285873

Adjacent sequences:  A167252 A167253 A167254 * A167256 A167257 A167258

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2009

STATUS

approved

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Last modified July 17 23:21 EDT 2019. Contains 325109 sequences. (Running on oeis4.)