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.

5, 24, 156, 1123, 8268, 60569, 446426, 3333345, 25146354, 190958245, 1457049922, 11161985897, 85804483994, 661561762629, 5113755311738, 39616036230913, 307500608317658, 2390939974122621, 18619094389326362, 145193529732807545

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