A222830 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

0, 32, 2120, 114782, 5459252, 346343088, 17812721025, 1142470649401, 58980648163832, 3852418637358246, 200706673436292108, 13243427433214319023, 693625799476691177636, 46113394821687632448294, 2425015336246882407219638

Offset

1,2

Comments

Column 3 of A222832

Links

R. H. Hardin, Table of n, a(n) for n = 1..63

Example

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

Crossrefs

Sequence in context: A268054 A268077 A202547 * A079202 A294607 A294953

Adjacent sequences: A222827 A222828 A222829 * A222831 A222832 A222833

Keyword

nonn

Author

R. H. Hardin Mar 06 2013

Status

approved