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A240518
Number of nX7 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order
1
21, 86, 515, 3765, 28942, 231665, 1906245, 16000486, 135790448, 1158315893, 9946076742, 85823282205, 743139183617, 6451236349918, 56119492560507, 488978060398481, 4265874977466648, 37250999894755072, 325525391487428809
OFFSET
1,1
COMMENTS
Column 7 of A240519
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..1..0..1..0....0..1..1..1..0..1..0....0..1..0..1..0..1..0
..0..1..0..1..0..1..0....1..0..1..0..1..1..1....1..0..1..1..0..0..1
..1..0..1..0..1..0..1....0..1..0..1..0..1..0....0..0..0..1..0..1..1
..0..1..1..1..0..1..0....1..1..1..0..1..0..1....1..0..1..0..1..0..1
CROSSREFS
Sequence in context: A045016 A171129 A301540 * A219850 A158540 A304514
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 06 2014
STATUS
approved