A254533 Number of length n 1..(2+2) arrays with no leading partial sum equal to a prime

2, 3, 8, 20, 50, 126, 329, 956, 2897, 8341, 23238, 66544, 194686, 555838, 1532445, 4225095, 12140873, 36623429, 112964359, 345148105, 1027400959, 2988415841, 8604041257, 24715209608, 70743541258, 201532200098, 575286723544

Offset

1,1

Comments

Column 2 of A254539

Links

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

Example

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

Crossrefs

Sequence in context: A092031 A082914 A333680 * A095341 A167123 A029895

Adjacent sequences: A254530 A254531 A254532 * A254534 A254535 A254536

Keyword

nonn

Author

R. H. Hardin, Feb 01 2015

Status

approved