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A167248 Number of ways to partition an n X 4 grid into 4 connected equal-area regions 0
1, 5, 23, 117, 501, 2369, 9525, 39731, 145415, 554487, 1975561, 7301317, 25334269 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

All solutions for n=3

...1.1.2.3...1.1.2.2...1.1.2.2...1.1.2.3...1.1.2.2...1.1.2.2...1.1.1.2

...1.2.2.3...1.3.2.4...1.3.4.2...1.4.2.3...3.1.2.4...3.1.4.2...3.3.2.2

...4.4.4.3...3.3.4.4...3.3.4.4...4.4.2.3...3.3.4.4...3.3.4.4...3.4.4.4

------

...1.1.1.2...1.1.1.2...1.1.1.2...1.1.2.3...1.2.2.2...1.2.2.3...1.2.2.3

...3.3.4.2...3.3.3.2...3.4.4.2...4.1.2.3...1.1.3.3...1.1.2.3...1.2.3.3

...3.4.4.2...4.4.4.2...3.3.4.2...4.4.2.3...4.4.4.3...4.4.4.3...1.4.4.4

------

...1.2.2.3...1.2.3.3...1.2.3.3...1.2.3.3...1.2.3.4...1.2.2.2...1.2.2.2

...1.2.4.3...1.2.2.3...1.2.3.4...1.2.4.3...1.2.3.4...1.3.3.4...1.3.3.3

...1.4.4.3...1.4.4.4...1.2.4.4...1.2.4.4...1.2.3.4...1.3.4.4...1.4.4.4

------

...1.2.2.2...1.2.2.3

...1.3.4.4...1.4.2.3

...1.3.3.4...1.4.4.3

CROSSREFS

Sequence in context: A113284 A104090 A073596 * A321798 A005393 A193704

Adjacent sequences:  A167245 A167246 A167247 * A167249 A167250 A167251

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2009

STATUS

approved

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Last modified January 20 06:07 EST 2019. Contains 319323 sequences. (Running on oeis4.)