A249215 Number of length 3+6 0..n arrays with no seven consecutive terms having five times the sum of any two elements equal to two times the sum of the remaining five

496, 11874, 183516, 1287632, 6631348, 26526142, 89437990, 259680594, 678836386, 1608960332, 3563385010, 7370543098, 14518880248, 27241408064, 49261449504, 85646747520, 144718409622, 237078221134

Offset

1,1

Comments

Row 3 of A249212

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Sequence in context: A349699 A303623 A249200 * A249322 A110847 A160472

Adjacent sequences: A249212 A249213 A249214 * A249216 A249217 A249218

Keyword

nonn

Author

R. H. Hardin, Oct 23 2014

Status

approved