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A186528 Number of (n+1)X2 0..2 arrays with no 2X2 subblock determinant equal to any horizontal or vertical neighbor 2X2 subblock determinant 2
81, 554, 4020, 28522, 203346, 1448300, 10317234, 73494218, 523535260, 3729392026, 26566253962, 189244190416, 1348077312794, 9603002534510, 68406801866740, 487294523222534, 3471233063104946, 24727261243092472, 176144164759542978 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A186536
LINKS
FORMULA
Empirical: a(n)=3*a(n-1)+17*a(n-2)+66*a(n-3)+129*a(n-4)+183*a(n-5)+162*a(n-6)-29*a(n-7)-150*a(n-8)-189*a(n-9)-109*a(n-10)-2*a(n-11)+8*a(n-12) for n>13
EXAMPLE
Some solutions for 3X2
..2..2....2..2....2..0....0..0....1..1....2..0....2..2....1..1....0..2....2..2
..1..0....2..2....2..1....2..0....1..2....2..1....2..2....2..2....0..1....2..0
..2..2....2..0....0..2....1..2....2..2....1..0....0..1....1..2....1..1....1..0
CROSSREFS
Sequence in context: A231973 A205894 A186536 * A253294 A253164 A185777
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 23 2011
STATUS
approved

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Last modified February 27 19:24 EST 2024. Contains 370378 sequences. (Running on oeis4.)