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A167247 Number of ways to partition an n X 4 grid into 2 connected equal-area regions 0
1, 4, 19, 70, 245, 856, 2967, 10164, 34463, 115904, 387379, 1288574, 4270853, 14116936, 46567963, 153385198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

All solutions for n=3

...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1

...1.1.2.2...1.2.1.2...1.2.2.1...1.2.2.2...2.1.1.2...2.1.2.1...2.2.1.1

...2.2.2.2...2.2.2.2...2.2.2.2...1.2.2.2...2.2.2.2...2.2.2.2...2.2.2.2

------

...1.1.1.1...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2...1.1.2.2...1.1.2.2

...2.2.2.1...1.1.1.2...1.1.2.2...1.2.1.2...1.2.2.2...1.1.1.2...1.1.2.2

...2.2.2.1...2.2.2.2...1.2.2.2...1.2.2.2...1.1.2.2...1.2.2.2...1.1.2.2

------

...1.1.2.2...1.2.2.2...1.2.2.2...1.2.2.2...1.2.2.2

...1.2.2.2...1.1.1.2...1.1.2.2...1.2.1.2...1.2.2.2

...1.1.1.2...1.1.2.2...1.1.1.2...1.1.1.2...1.1.1.1

CROSSREFS

Sequence in context: A291888 A217324 A129019 * A267192 A219972 A284224

Adjacent sequences:  A167244 A167245 A167246 * A167248 A167249 A167250

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2009

STATUS

approved

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Last modified December 9 19:51 EST 2019. Contains 329879 sequences. (Running on oeis4.)