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A183306
Half the number of nX5 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors
2
3, 9, 42, 178, 910, 4212, 19899, 94217, 445859, 2113257, 10006598, 47387904, 224418390, 1062810762, 5033385029, 23837475807, 112891241315, 534638647159, 2531982065694, 11991154349342, 56788620500294, 268943860673076
OFFSET
1,1
COMMENTS
Column 5 of A183312
LINKS
FORMULA
Empirical: a(n)=9*a(n-1)-26*a(n-2)+24*a(n-3)+47*a(n-4)-157*a(n-5)-43*a(n-6)+641*a(n-7)-643*a(n-8)-952*a(n-9)+3460*a(n-10)-2021*a(n-11)-2111*a(n-12)+2715*a(n-13)-1249*a(n-14)-4657*a(n-15)-1514*a(n-16)+1961*a(n-17)-1230*a(n-18)+6713*a(n-19)+8832*a(n-20)+10212*a(n-21)+1971*a(n-22)-6552*a(n-23)-2819*a(n-24)-2898*a(n-25)-973*a(n-26)+302*a(n-27)+433*a(n-28)+286*a(n-29) for n>31
EXAMPLE
Some solutions with a(1,1)=0 for 5X4
..0..0..1..0....0..1..1..0....0..1..0..1....0..1..1..0....0..1..0..1
..1..1..0..1....1..0..0..1....0..1..0..0....1..0..0..1....1..0..0..1
..0..1..1..0....0..1..1..0....1..0..1..1....1..0..0..1....0..1..1..0
..1..0..0..1....1..0..0..1....0..1..1..0....0..1..1..0....1..0..1..1
..1..0..1..0....0..1..0..1....1..0..0..1....1..0..1..0....0..1..0..0
CROSSREFS
Sequence in context: A293955 A113271 A249045 * A057724 A129879 A264521
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved