A254198 Number of length n 1..(2+2) arrays with no leading or trailing partial sum equal to a prime

2, 1, 2, 6, 11, 27, 53, 133, 310, 691, 1722, 4898, 13169, 31188, 68247, 151695, 355719, 880650, 2386625, 7052660, 20845775, 57431942, 145661869, 346176887, 792710311, 1828054653, 4509979089, 12381748520, 37284100779, 117101693844, 362950924700

Offset

1,1

Comments

Column 2 of A254204

Links

R. H. Hardin, Table of n, a(n) for n = 1..49

Example

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

Crossrefs

Sequence in context: A110422 A131804 A307519 * A246466 A170829 A032085

Adjacent sequences: A254195 A254196 A254197 * A254199 A254200 A254201

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved