A254212 - OEIS

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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.

1

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

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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