A247725 Number of length n+3 0..7 arrays with no disjoint pairs in any consecutive four terms having the same sum

3248, 20816, 133780, 860360, 5532212, 35577396, 228817500, 1471661464, 9465023576, 60874728614, 391519927124, 2518086482802, 16195230721252, 104160655154148, 669915976764744, 4308607742197298, 27711087156320840

Offset

1,1

Comments

Column 7 of A247726

Links

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

Example

Some solutions for n=3
..7....7....7....6....6....4....0....6....2....5....5....2....7....2....0....2
..6....0....6....3....4....3....3....7....3....6....4....4....2....1....6....1
..3....7....7....0....7....7....6....1....6....0....1....7....3....4....7....2
..7....2....4....0....2....4....6....1....6....3....1....2....4....6....0....6
..5....1....4....6....1....2....2....0....0....7....3....0....6....6....7....2
..2....2....5....4....5....6....6....6....7....7....0....3....2....2....2....5

Crossrefs

Sequence in context: A118212 A233750 A252014 * A265198 A269061 A253332

Adjacent sequences: A247722 A247723 A247724 * A247726 A247727 A247728

Keyword

nonn

Author

R. H. Hardin, Sep 23 2014

Status

approved