A254221 Number of length 4 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

0, 2, 4, 22, 24, 96, 168, 388, 490, 1024, 1168, 2138, 3000, 4554, 5084, 7872, 8570, 12358, 15532, 20538, 22120, 30338, 35972, 45928, 54068, 66830, 71348, 90658, 95374, 115162, 132074, 156726, 177542, 212556, 221796, 258292, 289706, 334554, 349466

Offset: 1

Author

R. H. Hardin, Jan 26 2015

Keywords

• nonn

Comments

Row 4 of A254218

Examples

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

Links

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