A254202 Number of length n 1..(6+2) arrays with no leading or trailing partial sum equal to a prime.

4, 11, 47, 195, 898, 4353, 22189, 112015, 542397, 2658643, 13811570, 74759723, 402860778, 2116039998, 11034558825, 58963729401, 324783927568, 1798939119729, 9744887456018, 51258432916302, 268071351841619, 1461410535224478

Offset: 1

Author

R. H. Hardin, Jan 26 2015

Keywords

• nonn

Comments

Column 6 of A254204

Examples

			Some solutions for n=4
..8....4....8....4....8....6....6....6....1....8....4....4....8....1....8....4
..4....4....6....8....8....2....3....6....3....4....4....5....6....5....1....2
..6....2....2....4....4....6....7....8....4....6....8....3....7....2....3....6
..4....6....4....6....8....8....8....1....8....6....4....6....1....8....6....8