A183766 1/32 the number of (2n+1) X 4 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.

40, 7392, 1555840, 346131968, 79420170240, 18585877094400, 4409408507412480, 1056689477487820800, 255189244398549336064, 62004700939478066266112, 15140238779254079729172480, 3712064235466595220724908032

Offset

1,1

Comments

Column 3 of A183772(2n).

Links

Ron Hardin, Table of n, a(n) for n = 1..100

Example

Some solutions for 3 X 4:
..1..0..1..0....0..0..0..0....0..1..1..1....0..0..0..1....1..0..0..1
..0..1..1..0....0..1..1..0....0..1..0..1....1..0..1..0....0..0..1..0
..0..1..0..0....0..1..0..1....0..1..1..0....1..1..0..1....1..1..1..0

Crossrefs

Sequence in context: A196949 A201624 A295587 * A364517 A184892 A119525

Adjacent sequences: A183763 A183764 A183765 * A183767 A183768 A183769

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved