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A222660
Number of nX2 0..3 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
1
0, 0, 2, 9, 26, 103, 446, 1964, 8624, 38467, 172996, 781826, 3543506, 16101962, 73319508, 334431875, 1527675428, 6987461432, 31997430636, 146680198680, 673052434686, 3091103533619, 14208094465250, 65356612821710
OFFSET
1,3
COMMENTS
Column 2 of A222666
LINKS
EXAMPLE
All solutions for n=3
..0..0....0..1
..0..0....1..1
..0..1....1..1
CROSSREFS
Sequence in context: A136429 A091469 A125670 * A182325 A008910 A373603
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2013
STATUS
approved