login
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
OFFSET
1,2
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: A305155 A355965 A231885 * A147247 A028468 A146995
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 31 2009
STATUS
approved