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A254198 Number of length n 1..(2+2) arrays with no leading or trailing partial sum equal to a prime 1
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 (list; graph; refs; listen; history; text; internal format)
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: A259992 A110422 A131804 * A246466 A170829 A032085

Adjacent sequences:  A254195 A254196 A254197 * A254199 A254200 A254201

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 26 2015

STATUS

approved

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Last modified February 23 11:33 EST 2018. Contains 299579 sequences. (Running on oeis4.)