A185806 Number of (n+1)X9 0..3 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

85438016, 847003638592, 3849846787713472, 21422296324609759008, 114404199665472905793216

Offset

1,1

Comments

Column 8 of A185807

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A295465 A230794 A186922 * A381318 A115534 A138030

Adjacent sequences: A185803 A185804 A185805 * A185807 A185808 A185809

Keyword

nonn

Author

R. H. Hardin, Feb 04 2011

Status

approved