A249227 Number of length n+5 0..2 arrays with no six consecutive terms having two times the sum of any two elements equal to the sum of the remaining four

486, 972, 1944, 3888, 7776, 15552, 31104, 62208, 124416, 248832, 497664, 995328, 1990656, 3981312, 7962624, 15925248, 31850496, 63700992, 127401984, 254803968, 509607936, 1019215872, 2038431744, 4076863488, 8153726976, 16307453952

Offset

1,1

Comments

Column 2 of A249233

Links

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

Formula

Empirical: a(n) = 2*a(n-1)

Example

Some solutions for n=9
..1....0....0....1....1....1....0....1....1....0....1....0....1....0....1....0
..1....2....2....1....0....1....1....0....1....1....1....2....2....1....0....1
..0....2....1....2....0....0....2....0....1....1....1....0....2....1....1....2
..2....2....0....1....0....2....1....1....2....1....0....1....1....1....2....0
..0....0....0....1....0....2....2....1....2....1....1....1....1....0....2....1
..1....2....2....1....0....2....2....2....1....0....1....0....1....2....1....1
..0....0....0....1....2....1....0....1....1....0....1....0....0....2....1....0
..2....2....1....2....2....1....0....2....0....1....1....0....0....2....1....1
..2....2....2....1....0....2....2....1....2....2....0....0....2....0....0....1
..0....2....2....2....0....0....2....0....2....1....1....0....1....1....2....0
..0....2....1....0....1....1....1....1....2....0....1....1....0....1....2....2
..1....0....1....1....0....0....0....0....1....1....1....1....1....2....2....0
..0....2....0....1....1....0....2....0....0....2....1....0....1....2....1....0
..1....2....1....2....2....1....0....0....1....2....1....0....0....2....0....1

Crossrefs

Sequence in context: A097767 A031520 A235525 * A130181 A158325 A187860

Adjacent sequences: A249224 A249225 A249226 * A249228 A249229 A249230

Keyword

nonn

Author

R. H. Hardin, Oct 23 2014

Status

approved