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A212235
Number of 0..2 arrays of length 2+2*n with sum no more than 2*n in any length 2n subsequence (=50% duty cycle)
1
31, 311, 2902, 26637, 242780, 2204646, 19976155, 180744711, 1633768428, 14757208260, 133224377745, 1202213897088, 10845157390965, 97807813761227, 881892198839574, 7950191559259765, 71659250039164212, 645816864760873772
OFFSET
1,1
COMMENTS
Row 3 of A212232
LINKS
EXAMPLE
Some solutions for n=3
..0....0....1....0....0....1....1....0....2....1....1....2....2....0....0....1
..0....1....0....1....1....0....1....2....2....0....1....1....0....2....0....1
..0....0....0....1....1....1....0....1....1....0....0....0....0....1....0....2
..0....1....0....0....1....0....0....0....0....0....0....0....0....0....2....0
..0....0....1....1....1....2....2....1....0....0....2....1....0....0....0....2
..0....1....1....0....2....0....1....1....0....0....1....0....1....0....2....0
..0....2....2....0....0....0....1....1....1....1....2....0....1....0....1....0
..1....1....1....1....1....0....2....1....2....2....1....2....0....0....1....1
CROSSREFS
Sequence in context: A152033 A125394 A200913 * A126552 A068813 A221306
KEYWORD
nonn
AUTHOR
R. H. Hardin May 06 2012
STATUS
approved