A167249 Number of ways to partition a 3*n X 4 grid into 6 connected equal-area regions

11, 2003, 244252, 22351172, 1403637121

Offset

1,1

Links

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

Example

Some solutions for n=3
...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2
...1.1.2.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.2.2
...1.3.2.2...1.3.2.2...1.3.2.2...1.3.2.2...1.3.2.2...1.3.2.2...1.3.2.2
...4.3.3.2...3.3.3.2...3.3.3.2...3.3.3.2...3.3.3.2...3.3.3.2...3.3.3.2
...4.3.3.5...4.3.3.5...4.3.5.5...3.3.4.4...3.3.4.4...4.3.3.5...3.3.4.4
...4.6.3.5...4.6.6.5...4.3.5.5...4.4.4.4...5.4.4.4...4.6.5.5...5.5.5.4
...4.6.5.5...4.4.6.5...4.6.6.5...5.6.6.6...5.6.6.4...4.6.6.5...5.6.6.4
...4.6.5.5...4.6.6.5...4.6.6.5...5.6.6.6...5.6.6.6...4.6.6.5...5.6.4.4
...4.6.6.6...4.6.5.5...4.4.6.6...5.5.5.5...5.5.5.6...4.4.6.5...5.6.6.6

Crossrefs

Sequence in context: A028453 A024151 A114354 * A180587 A060885 A020519

Adjacent sequences: A167246 A167247 A167248 * A167250 A167251 A167252

Keyword

nonn

Author

R. H. Hardin Oct 31 2009

Status

approved