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A188825 Number of 3Xn binary arrays without the pattern 0 1 diagonally or antidiagonally 4
8, 16, 48, 144, 432, 1296, 3888, 11664, 34992, 104976, 314928, 944784, 2834352, 8503056, 25509168, 76527504, 229582512, 688747536, 2066242608, 6198727824, 18596183472, 55788550416, 167365651248, 502096953744, 1506290861232 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 3 of A188824
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) for n>2
EXAMPLE
Some solutions for 3X3
..1..1..0....1..1..1....1..1..1....1..1..1....1..0..1....1..1..1....1..0..1
..0..0..1....1..1..0....1..1..1....0..0..0....0..1..0....1..1..0....0..1..0
..0..0..0....1..0..1....0..0..1....0..0..0....1..0..1....1..0..0....0..0..0
CROSSREFS
Sequence in context: A022444 A089828 A297619 * A214204 A335771 A159038
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 11 2011
STATUS
approved

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Last modified March 1 02:07 EST 2024. Contains 370429 sequences. (Running on oeis4.)