A249240 Number of length 7+5 0..n arrays with no six consecutive terms having two times the sum of any two elements equal to the sum of the remaining four

422, 31104, 1365524, 19188990, 171561694, 1195936390, 6483080144, 28086995286, 111475346884, 380335170960, 1167836929374, 3332406055028, 8765941903238, 21457348698458, 50079468971542, 110467990168082, 232510958777794

Offset

1,1

Comments

Row 7 of A249233

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for n=2
..0....2....2....1....2....1....1....2....2....0....0....0....1....0....2....2
..2....0....1....2....0....2....0....1....0....2....2....2....2....1....2....1
..0....1....1....2....0....1....2....1....1....0....2....1....1....0....2....0
..0....1....0....2....1....1....2....1....0....2....1....1....1....0....2....1
..0....1....1....1....1....0....0....0....1....0....0....2....0....2....1....0
..2....0....2....0....1....2....0....2....1....1....0....1....2....2....2....0
..1....2....0....0....2....1....0....0....1....2....0....1....2....2....2....2
..1....0....0....0....0....2....0....0....1....0....2....1....2....1....1....1
..0....0....1....1....0....2....2....2....1....0....1....1....1....0....0....0
..1....2....0....0....0....0....0....1....0....1....2....2....1....1....1....2
..2....0....1....0....2....1....0....2....1....1....2....2....2....2....2....0
..0....0....0....0....1....1....0....2....0....1....0....0....0....1....1....2

Crossrefs

Sequence in context: A231585 A231837 A231745 * A231698 A248455 A238285

Adjacent sequences: A249237 A249238 A249239 * A249241 A249242 A249243

Keyword

nonn

Author

R. H. Hardin, Oct 23 2014

Status

approved