A249200 Number of length 3+6 0..n arrays with no seven consecutive terms having four times the sum of any three elements equal to three times the sum of the remaining four.

496, 11874, 175616, 1257084, 6487112, 25682744, 86727506, 251999682, 654879578, 1551095120, 3414467722, 7040717068, 13797794578, 25848371224, 46531935056, 80819400770, 136099480924

Offset

1,1

Comments

Row 3 of A249197

Links

Table of n, a(n) for n=1..17.

Example

Some solutions for n=3
..0....2....2....0....0....1....0....0....0....2....0....1....0....2....2....2
..0....0....1....1....0....0....0....0....0....3....1....0....1....0....2....3
..1....0....2....2....3....0....0....3....3....0....0....0....1....1....0....0
..0....3....1....2....3....3....2....0....3....3....0....0....1....2....3....0
..1....3....2....1....0....1....3....1....2....1....1....1....0....0....3....2
..3....0....2....3....1....2....3....0....0....0....3....0....0....3....0....3
..3....0....2....0....1....3....0....1....2....3....0....1....2....2....3....2
..1....0....2....2....0....0....2....0....2....2....0....2....1....2....0....1
..0....0....0....2....1....3....0....0....0....2....0....0....1....2....1....2

Crossrefs

Sequence in context: A302888 A349699 A303623 * A249215 A249322 A110847

Adjacent sequences: A249197 A249198 A249199 * A249201 A249202 A249203

Keyword

nonn

Author

R. H. Hardin, Oct 23 2014

Status

approved