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)

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A212232 A212233 A212234 * A212236 A212237 A212238

Keyword

nonn

Author

R. H. Hardin May 06 2012

Status

approved