A185887 1/729 the number of (n+2)X7 0..2 arrays with no 3X3 subblock trace equal to any horizontal or vertical neighbor 3X3 subblock trace

6195480, 3246601822, 1859643383374, 1060306245936410, 601942558514445972, 341943649302595064930, 194280290689274140633844, 110380142237960121367785334, 62713144775703640933821912808

Offset

1,1

Comments

Column 5 of A185891

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

Some solutions for 4X7
..0..0..0..0..0..2..0....0..0..0..2..1..1..2....0..0..0..1..0..1..0
..0..0..0..0..1..1..1....0..0..0..0..2..1..1....0..0..0..0..1..2..2
..0..0..0..1..0..2..1....0..0..0..1..2..2..2....0..0..0..1..0..0..2
..0..0..1..0..0..0..2....0..0..1..0..0..0..2....0..0..1..0..0..0..2

Crossrefs

Sequence in context: A254592 A254360 A224640 * A306872 A186838 A204654

Adjacent sequences: A185884 A185885 A185886 * A185888 A185889 A185890

Keyword

nonn

Author

R. H. Hardin Feb 05 2011

Status

approved