A184771 Number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock singular.

2358280, 7339536784, 1005763454224, 1156853256240592, 308462363918463952, 225203116583181557968, 83362210743024650511568, 49227749118673440429632464, 21277949728043116377816749008

Offset

1,1

Comments

Column 7 of A184773.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for 3 X 8
..0..0..0..0..2..0..1..0....0..0..0..0..2..1..0..3....0..0..0..0..1..2..2..2
..0..0..0..0..2..0..2..0....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0
..0..0..0..0..0..0..1..0....0..0..0..0..3..2..2..1....0..0..0..0..1..2..2..1

Crossrefs

Cf. A184773.

Sequence in context: A340055 A246226 A204944 * A210075 A187016 A237487

Adjacent sequences: A184768 A184769 A184770 * A184772 A184773 A184774

Keyword

nonn

Author

R. H. Hardin, Jan 21 2011

Status

approved