A254212 Number of length n 1..(2+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

2, 0, 1, 2, 2, 2, 2, 2, 5, 4, 5, 8, 31, 64, 83, 66, 60, 104, 158, 240, 846, 2990, 6296, 8440, 10213, 14034, 16843, 15538, 20339, 57766, 202098, 751354, 2575608, 6730882, 12332861, 15945860, 15602393, 13432584, 12250132, 12687426, 23661609, 144529800

Offset

1,1

Links

Alois P. Heinz, Table of n, a(n) for n = 1..300 (first 51 terms from R. H. Hardin)

Example

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

Crossrefs

Column k=2 of A254218.

Sequence in context: A260411 A199331 A243917 * A033773 A029275 A058739

Adjacent sequences: A254209 A254210 A254211 * A254213 A254214 A254215

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved