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

1,2

Comments

Row 4 of A254218

Links

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

Example

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

Crossrefs

Sequence in context: A151809 A151801 A284920 * A366060 A298471 A348785

Adjacent sequences: A254218 A254219 A254220 * A254222 A254223 A254224

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved