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

Author

R. H. Hardin, Jan 26 2015

Keywords

• nonn

Examples

			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.

Extensions

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