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A222900
Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
1
1, 4, 14, 75, 411, 2522, 15919, 103627, 683480, 4554799, 30542304, 205785953, 1391485044, 9436529666, 64150640719, 437015936703, 2982527052975, 20387828050502, 139566607631735, 956650211233825, 6564964362464004
OFFSET
1,2
COMMENTS
Column 2 of A222906
LINKS
EXAMPLE
Some solutions for n=3
..0..0....0..0....0..1....0..0....0..1....0..0....0..0....0..1....0..0....0..0
..1..2....0..0....1..1....0..1....0..0....0..1....0..0....2..2....1..0....0..0
..2..2....0..0....1..1....0..0....0..0....1..1....1..2....2..2....0..0....1..0
CROSSREFS
Sequence in context: A088127 A242739 A007282 * A222485 A009347 A341505
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved