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A184601 1/4 the number of (n+1) X 7 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3. 1
784, 60569, 6045460, 661355087, 75369979530, 8783684627835, 1038876920232926, 124201308194651058, 14971003403040041129, 1816251101842544994491, 221492117754765269030948, 27126817151861700072792723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A184604.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for 3 X 7:

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

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

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

CROSSREFS

Sequence in context: A223493 A231976 A188782 * A151658 A231771 A252389

Adjacent sequences: A184598 A184599 A184600 * A184602 A184603 A184604

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2011

STATUS

approved

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Last modified January 30 10:26 EST 2023. Contains 359943 sequences. (Running on oeis4.)