A249237 Number of length 4+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.

136, 3888, 60744, 448148, 2325864, 9772492, 34184700, 102003646, 280506352, 694716964, 1591981864, 3441580468, 7017193772, 13588351272, 25335534664, 45379544842, 78550414352, 132184098358, 216354909052, 345309250322

Offset

1,1

Comments

Row 4 of A249233.

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

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

Crossrefs

Cf. A249233.

Sequence in context: A251940 A071231 A233102 * A194014 A248452 A035819

Adjacent sequences: A249234 A249235 A249236 * A249238 A249239 A249240

Keyword

nonn

Author

R. H. Hardin, Oct 23 2014

Status

approved