A247921 Number of length n+4 0..2 arrays with some disjoint pairs in every consecutive five terms having the same sum.

203, 529, 1387, 3649, 9611, 25265, 66443, 174817, 460139, 1211409, 3189259, 8396641, 22107499, 58209297, 153270315, 403580257, 1062688075, 2798238641, 7368281835, 19402138145, 51089798827, 134530145105, 354246523595

Offset

1,1

Comments

Column 2 of A247927.

Links

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

Formula

Empirical: a(n) = 3*a(n-1) -2*a(n-3) -a(n-4) +6*a(n-5) -14*a(n-6) -13*a(n-7) -2*a(n-8) +8*a(n-9) -4*a(n-10) +8*a(n-11) +8*a(n-12).

Example

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

Crossrefs

Cf. A247927.

Sequence in context: A348664 A228320 A346899 * A346883 A240903 A250751

Adjacent sequences: A247918 A247919 A247920 * A247922 A247923 A247924

Keyword

nonn

Author

R. H. Hardin, Sep 26 2014

Status

approved