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A183771 1/32 the number of (n+1) X 9 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1. 1
2240, 823680, 346131968, 153876579840, 70577422755840, 33021546171494400, 15664518350357381120, 7506428481300850827264, 3625062729947846895239168, 1761398107886979915147182080, 860111024347049203759900262400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A183772.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..29

EXAMPLE

Some solutions for 3 X 9:

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

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

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

CROSSREFS

Sequence in context: A186865 A038728 A002520 * A271470 A263912 A251051

Adjacent sequences:  A183768 A183769 A183770 * A183772 A183773 A183774

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified June 19 06:47 EDT 2019. Contains 324218 sequences. (Running on oeis4.)