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A167240 Number of ways to partition a 3*n X 2 grid into 6 connected equal-area regions 0
1, 13, 41, 169, 441, 1109, 2289, 4497, 7953, 13533, 21593, 33465, 49673, 72101, 101473, 140321, 189601 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=4

...1.1...1.2...1.1...1.1...1.1...1.1...1.2...1.1...1.1...1.1...1.1...1.1...1.1

...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.1...1.2...1.1...1.1...2.1...2.1

...1.2...1.2...1.2...1.2...1.2...1.2...1.2...2.2...1.2...2.2...2.2...2.1...2.1

...3.2...1.2...2.2...2.2...3.2...2.2...1.2...3.2...2.2...2.3...2.3...2.3...2.2

...3.2...3.3...3.3...3.3...3.2...3.3...3.4...3.2...3.3...2.3...2.3...2.3...3.3

...3.3...3.3...3.4...4.3...3.4...3.3...3.4...3.4...3.3...3.3...3.3...3.3...4.3

...4.4...4.4...3.4...4.3...3.4...4.4...3.4...3.4...4.4...4.4...4.4...4.4...4.3

...5.4...5.4...5.4...4.4...4.4...4.4...3.4...4.4...4.5...4.4...4.4...4.4...4.4

...5.4...5.4...5.4...5.6...5.5...5.5...5.5...5.5...4.5...5.5...5.6...5.5...5.5

...5.6...5.5...5.6...5.6...5.6...5.6...6.5...6.5...6.5...5.5...5.6...5.5...5.5

...5.6...6.6...5.6...5.6...5.6...5.6...6.5...6.5...6.5...6.6...5.6...6.6...6.6

...6.6...6.6...6.6...5.6...6.6...6.6...6.6...6.6...6.6...6.6...5.6...6.6...6.6

CROSSREFS

Sequence in context: A123972 A167585 A141970 * A147247 A028468 A146995

Adjacent sequences:  A167237 A167238 A167239 * A167241 A167242 A167243

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2009

STATUS

approved

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Last modified May 19 19:20 EDT 2013. Contains 225436 sequences.