A187134 Number of (n+1)X4 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

405, 19062, 267840, 5755698, 99203418, 1921749372, 34994620836, 658156407930, 12168728064540, 227006548039242, 4215046606416756, 78456814617739176, 1458483057478165140, 27130892560870689198, 504514738674275619150

Offset

1,1

Comments

Column 3 of A187140

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 6X4
..0..0..0..0....2..0..0..0....1..0..0..0....1..0..0..0....0..0..0..0
..2..0..0..0....1..0..0..0....1..0..0..0....1..0..0..0....2..0..0..0
..2..0..1..0....2..1..0..0....1..0..0..0....2..0..1..0....2..0..1..0
..0..0..1..0....1..0..0..2....0..0..1..1....2..0..2..2....0..0..1..2
..2..2..2..2....2..1..1..2....0..0..2..2....1..1..2..1....2..2..2..2
..0..1..1..1....1..0..1..1....0..0..2..1....0..2..2..1....1..2..2..1

Crossrefs

Sequence in context: A224527 A219147 A239541 * A185839 A285924 A285860

Adjacent sequences: A187131 A187132 A187133 * A187135 A187136 A187137

Keyword

nonn

Author

R. H. Hardin Mar 05 2011

Status

approved