A247989 Number of length n+5 0..2 arrays with no disjoint triples in any consecutive six terms having the same sum

396, 702, 1264, 2314, 4308, 8150, 15640, 30620, 60192, 118756, 235048, 466476, 927792, 1850424, 3692608, 7372360, 14725200, 29421656, 58802272, 117563504, 235061376, 470020240, 939884704, 1879539888, 3758751936, 7517176032

Offset

1,1

Comments

Column 2 of A247995

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +10*a(n-6) -20*a(n-7) -16*a(n-12) +32*a(n-13)

Example

Some solutions for n=6
..1....2....2....2....2....2....0....2....0....0....2....0....1....2....0....2
..0....2....1....0....0....1....2....0....2....0....0....0....0....0....2....1
..2....2....2....0....2....2....2....2....2....0....0....1....2....0....2....1
..0....2....2....0....2....2....0....0....0....2....1....2....2....2....0....0
..2....1....0....2....1....0....0....2....2....1....2....0....2....0....1....2
..2....0....2....2....0....0....1....1....0....2....0....2....2....2....0....1
..1....2....2....1....2....2....2....2....0....2....2....0....2....1....0....0
..0....0....1....2....0....0....0....0....1....2....0....2....1....0....2....1
..2....2....0....2....2....2....0....0....0....2....2....0....0....2....2....1
..0....2....2....2....2....1....2....2....0....0....1....1....2....2....0....0
..2....1....0....0....0....2....2....0....0....1....2....0....2....0....2....2

Crossrefs

Sequence in context: A278269 A278606 A230450 * A126078 A275171 A028299

Adjacent sequences: A247986 A247987 A247988 * A247990 A247991 A247992

Keyword

nonn

Author

R. H. Hardin, Sep 28 2014

Status

approved