A183768 1/32 the number of (2n+1) X 6 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.

2016, 5912192, 19855042560, 70577422755840, 258888921984516096, 968823452179344785408, 3676119951496408119115776, 14091184863095839321177456640, 54435471052008802940182132162560

Offset

1,1

Comments

Column 5 of A183772(2n).

Links

R. H. Hardin, Table of n, a(n) for n = 1..65

Example

Some solutions for 3 X 6:
..0..0..0..1..0..1....0..1..1..1..1..1....1..1..0..0..0..1....1..0..0..0..1..0
..0..1..1..1..0..1....0..1..0..1..0..0....1..1..1..1..0..1....0..1..1..1..1..1
..1..1..1..0..0..1....0..0..1..0..0..0....0..0..1..0..1..1....0..0..0..0..1..0

Crossrefs

Sequence in context: A223216 A110851 A282331 * A119517 A252334 A252327

Adjacent sequences: A183765 A183766 A183767 * A183769 A183770 A183771

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved