A185932 Number of (n+1)X9 0..3 arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace

18869769920, 463800149161728, 11957609765394118112, 306863268993289004333312, 7886218318718674417629561248, 202669623828919364821359439182528, 5208641276453182873667505562357251776

Offset

1,1

Comments

Column 8 of A185933

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 3X9
..2..0..0..0..0..0..0..1..3....2..0..0..0..0..0..0..3..3
..0..0..0..1..0..1..0..2..0....0..0..0..1..0..1..3..0..3
..0..0..2..0..0..0..0..0..2....0..0..2..0..0..0..0..1..2

Crossrefs

Sequence in context: A233486 A270895 A273186 * A262533 A317288 A234397

Adjacent sequences: A185929 A185930 A185931 * A185933 A185934 A185935

Keyword

nonn

Author

R. H. Hardin Feb 06 2011

Status

approved