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A184597 1/4 the number of (n+1) X 3 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3. 1
5, 24, 156, 1123, 8268, 60569, 446426, 3333345, 25146354, 190958245, 1457049922, 11161985897, 85804483994, 661561762629, 5113755311738, 39616036230913, 307500608317658, 2390939974122621, 18619094389326362, 145193529732807545 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A184604.

LINKS

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

EXAMPLE

Some solutions for 5 X 3:

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

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

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

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

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

CROSSREFS

Sequence in context: A241134 A340358 A009424 * A009601 A009676 A192995

Adjacent sequences:  A184594 A184595 A184596 * A184598 A184599 A184600

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2011

STATUS

approved

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Last modified June 18 07:25 EDT 2021. Contains 345098 sequences. (Running on oeis4.)