A254224 Number of length 7 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal

0, 2, 15, 383, 633, 6490, 18214, 60168, 97089, 296955, 420163, 1046085, 1799943, 3545675, 4664339, 9251052, 11630683, 20703803, 29730723, 47075466, 56991009, 93151404, 122440340, 182865306, 239287220, 341720757, 401640735, 596658745

Offset

1,2

Comments

Row 7 of A254218

Links

R. H. Hardin, Table of n, a(n) for n = 1..67

Example

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

Crossrefs

Sequence in context: A231443 A068391 A215743 * A071102 A272899 A060381

Adjacent sequences: A254221 A254222 A254223 * A254225 A254226 A254227

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved