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A186593 Number of (n+3)X6 0..3 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock 1
430183, 8853, 33006, 407733, 1398069, 1824789, 1889853, 1922661, 1956045, 1993893, 2122389, 2663373, 6952128, 12534435, 18583878, 25969209, 44698005, 67421001, 91930893, 122071401, 199108569, 304875258, 434150964, 602474511 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A186599
LINKS
FORMULA
Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-4)-6*a(n-5)+3*a(n-6)+3*a(n-8)-3*a(n-9) for n>13
EXAMPLE
Some solutions for 5X6
..0..0..0..0..0..1....2..0..0..0..0..0....0..0..0..0..0..3....0..0..0..0..1..0
..0..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..0..2....0..0..0..0..0..1
..1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1....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
..2..0..0..0..0..0....0..0..0..0..0..0....1..0..0..0..0..0....3..0..0..0..0..0
CROSSREFS
Sequence in context: A251639 A051595 A234857 * A328197 A233620 A271110
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2011
STATUS
approved

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Last modified June 16 19:52 EDT 2024. Contains 373432 sequences. (Running on oeis4.)