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A223122
Number of nX4 0..2 arrays with no more than floor(nX4/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
1
10, 489, 28907, 1780641, 112106293, 7157970340, 461597847603, 29989116614529, 1959625907209239, 128645318481467647, 8477443608456769792, 560422268684443059564, 37148157807866359018565, 2468123723995159036467948
OFFSET
1,1
COMMENTS
Column 4 of A223126
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..1....0..1..2..1....0..1..2..0....0..1..1..2....0..1..2..1
..0..1..1..2....0..1..2..2....2..1..1..0....0..1..0..2....0..1..2..1
..0..1..1..1....0..2..2..2....2..2..1..1....2..1..2..0....0..1..0..2
CROSSREFS
Sequence in context: A173157 A035320 A200458 * A071096 A039835 A293090
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 15 2013
STATUS
approved