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A186584 Number of (n+3)X7 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock 1
192026, 12263, 39757, 163723, 293665, 328891, 335737, 342691, 350257, 364195, 406729, 574195, 1025233, 1707435, 2460521, 3477379, 5076513, 7165851, 9482025, 12660675, 17905953, 25496043, 35045977, 48354579, 68994705, 98503131 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A186589
LINKS
FORMULA
Empirical: a(n)=2*a(n-1)-a(n-2)+2*a(n-4)-4*a(n-5)+2*a(n-6)+2*a(n-8)-2*a(n-9) for n>14
EXAMPLE
Some solutions for 5X7
..0..0..0..0..0..2..0....0..0..0..0..0..0..2....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..2
..0..0..0..0..0..0..2....0..0..0..0..0..0..1....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....1..0..0..0..0..0..0....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....2..2..0..0..0..0..0....0..0..0..0..0..0..0
CROSSREFS
Sequence in context: A206018 A233873 A256768 * A178289 A221003 A206619
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2011
STATUS
approved

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Last modified April 15 18:20 EDT 2024. Contains 371695 sequences. (Running on oeis4.)