A222375 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

4, 18, 118, 1391, 20340, 342953, 6221698, 113556454, 2103238076, 38940850866, 724814585064, 13496985711211, 251700828899740, 4703187944642436, 87873606070564444, 1646203673458642042, 30815057060615530576

Offset

1,1

Comments

Column 4 of A222378

Links

R. H. Hardin, Table of n, a(n) for n = 1..50

Example

Some solutions for n=4
..0..0..0..0....0..0..1..0....0..0..0..0....0..0..0..0....0..0..1..1
..0..0..0..0....0..0..2..1....0..0..0..0....0..0..0..0....0..1..1..1
..0..0..0..0....0..0..0..0....0..1..0..2....1..2..0..0....2..1..1..1
..1..1..2..2....0..0..0..0....0..0..0..0....2..3..0..0....2..2..1..1

Crossrefs

Sequence in context: A162224 A321704 A296982 * A053529 A005442 A306881

Adjacent sequences: A222372 A222373 A222374 * A222376 A222377 A222378

Keyword

nonn

Author

R. H. Hardin Feb 17 2013

Status

approved