A247407 Number of length 3+4 0..n arrays with no disjoint pairs in any consecutive five terms having the same sum

0, 40, 340, 3200, 17164, 65500, 201172, 553328, 1328468, 2988588, 6174668, 12011408, 22100648, 39018756, 66002280, 108120340, 171569292, 265248372, 399981360, 590794408, 854909260, 1216187576, 1701586288, 2346377932

Offset

1,2

Comments

Row 3 of A247404

Links

R. H. Hardin, Table of n, a(n) for n = 1..70

Example

Some solutions for n=6
..0....6....4....1....1....5....0....3....0....5....5....6....2....6....5....1
..3....0....0....6....1....2....2....6....6....6....2....6....6....4....6....1
..6....5....5....0....0....6....4....1....0....5....2....2....0....6....4....1
..2....2....3....6....4....0....4....1....2....0....1....0....0....3....2....0
..2....2....0....6....1....2....1....2....3....2....0....5....3....2....6....6
..0....1....6....4....1....2....4....4....0....6....2....5....4....2....3....4
..2....2....6....6....6....2....0....6....6....5....2....5....2....2....2....0

Crossrefs

Sequence in context: A087954 A160328 A365607 * A251431 A285919 A234913

Adjacent sequences: A247404 A247405 A247406 * A247408 A247409 A247410

Keyword

nonn

Author

R. H. Hardin, Sep 16 2014

Status

approved