A186922 Number of (n+1)X9 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

85438016, 563483938112, 1225810619871552, 3676830716968217056, 9921625782478580791520

Offset

1,1

Comments

Column 8 of A186923

Links

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

Example

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

Crossrefs

Sequence in context: A186091 A295465 A230794 * A185806 A115534 A138030

Adjacent sequences: A186919 A186920 A186921 * A186923 A186924 A186925

Keyword

nonn

Author

R. H. Hardin Feb 28 2011

Status

approved