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A185926
Number of (n+1)X3 0..3 arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace
1
3392, 130944, 5113920, 199644672, 7794298816, 304295071104, 11879903064384, 463800149161728, 18107098487806016, 706914428967789184, 27598458655461285312, 1077464102208099420416, 42064990145791861161664
OFFSET
1,1
COMMENTS
Column 2 of A185933
LINKS
FORMULA
Empirical: a(n)=15*a(n-1)+802*a(n-2)+5776*a(n-3)-13280*a(n-4)-165446*a(n-5)+218470*a(n-6)+1834338*a(n-7)-3769241*a(n-8)-5737257*a(n-9)+23686220*a(n-10)-22060678*a(n-11)-960030*a(n-12)+11338144*a(n-13)-3603928*a(n-14)-1266192*a(n-15)+533376*a(n-16)-43200*a(n-17)
EXAMPLE
Some solutions for 5X3
..2..0..0....2..0..0....2..0..0....2..0..0....2..0..0....2..0..0....2..0..0
..0..0..0....0..0..0....2..0..0....2..0..0....0..0..0....0..0..0....2..0..0
..2..0..1....2..3..2....2..3..1....3..1..2....1..1..2....2..1..3....3..3..2
..2..3..3....1..2..0....0..1..2....2..3..3....1..1..3....2..1..0....0..3..0
..0..0..3....2..2..0....1..0..1....2..3..0....0..0..1....3..0..3....0..0..3
CROSSREFS
Sequence in context: A262176 A172788 A185573 * A221009 A226667 A206507
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2011
STATUS
approved