A254217 Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

5, 12, 48, 168, 766, 3720, 18214, 81428, 362910, 1828848, 9781293, 49824190, 241134125, 1198202218, 6489872942, 36558663886, 196996500006, 982525116524, 4694315336320, 23819615009274, 140719786602875, 913403203820358, 5715151962243604, 32271875770787666

Offset

1,1

Links

Table of n, a(n) for n=1..24.

Example

Some solutions for n=4:
..6....4....4....6....4....8....4....4....1....4....1....8....1....4....9....6
..8....8....6....9....6....2....2....8....3....2....8....1....5....8....3....4
..2....2....2....3....5....5....3....3....5....3....5....6....6....4....4....5
..4....6....8....9....9....1....1....9....1....9....1....9....4....8....8....1

Crossrefs

Column k=7 of A254218.

Sequence in context: A195541 A006078 A046612 * A211951 A356539 A009425

Adjacent sequences: A254214 A254215 A254216 * A254218 A254219 A254220

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Extensions

a(19)-a(24) from Alois P. Heinz, Jan 27 2015

Status

approved