A183770 1/32 the number of (2n+1) X 8 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.

109824, 5134924800, 275588031713280, 15664518350357381120, 919029987874102029778944, 55014538812191247245224181760, 3339401594009138875954682737459200

Offset

1,1

Comments

Column 7 of A183772(2n).

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 3 X 8:
..0..0..0..0..0..1..0..0....0..0..0..0..0..1..0..1....0..0..0..0..0..0..1..1
..1..0..1..0..0..1..0..1....0..0..0..0..0..0..0..0....1..0..1..1..0..1..1..1
..1..0..1..0..1..0..0..0....1..0..1..1..1..0..1..1....0..1..1..1..0..1..1..0

Crossrefs

Sequence in context: A234700 A238061 A111888 * A023349 A368020 A138722

Adjacent sequences: A183767 A183768 A183769 * A183771 A183772 A183773

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved