A222742 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 32, 2438, 125094, 6821264, 413021606, 24065512554, 1471765337998, 87152464030990, 5404644628233066, 322906836991829172, 20211764295806702232, 1215888385906731445434, 76597296936236782196484

Offset

1,2

Comments

Column 3 of A222747

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A254458 A185968 A247999 * A077143 A198284 A230573

Adjacent sequences: A222739 A222740 A222741 * A222743 A222744 A222745

Keyword

nonn

Author

R. H. Hardin Mar 04 2013

Status

approved