A254199 Number of length n 1..(3+2) arrays with no leading or trailing partial sum equal to a prime

2, 1, 4, 9, 21, 47, 118, 333, 984, 3362, 12643, 39490, 98542, 227138, 581068, 1805114, 6540668, 24406560, 85426548, 274421967, 815755674, 2293410096, 6495970695, 20483223847, 74509476318, 290215121856, 1104108812114, 3894326230239

Offset

1,1

Comments

Column 3 of A254204

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

All solutions for n=4
..4....1....4....4....1....4....4....4....1
..4....3....2....5....5....4....2....2....3
..2....2....4....5....3....4....2....3....5
..4....4....4....4....1....4....4....1....1

Crossrefs

Sequence in context: A015943 A006445 A174255 * A343398 A097949 A268572

Adjacent sequences: A254196 A254197 A254198 * A254200 A254201 A254202

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved