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A184596 1/4 the number of (n+1) X 2 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3. 1
2, 5, 16, 58, 214, 784, 2880, 10704, 40264, 152728, 582424, 2229856, 8566528, 33011680, 127553920, 493989568, 1916920384, 7451582080, 29011376256, 113108257920, 441536615296, 1725575305600, 6750738252160, 26435046548992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A184604.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 3 X 2:

..0..1....0..0....1..1....1..1....0..0....1..1....1..0....0..0....0..0....1..0

..0..1....1..1....1..1....1..0....1..0....0..1....0..1....0..0....1..1....1..0

..1..0....1..1....1..1....0..0....1..1....0..0....0..1....1..1....0..0....0..1

CROSSREFS

Sequence in context: A157612 A184943 A286946 * A149978 A212263 A149979

Adjacent sequences:  A184593 A184594 A184595 * A184597 A184598 A184599

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2011

STATUS

approved

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Last modified May 10 05:10 EDT 2021. Contains 343748 sequences. (Running on oeis4.)