A254216 Number of length n 1..(6+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

4, 8, 32, 96, 373, 1472, 6490, 28190, 109811, 428042, 1877657, 8933652, 41803166, 184319728, 792231146, 3584762414, 17422197427, 85469221254, 398370084189, 1733366825266, 7251337491976, 32000172689890, 165843262226680, 977297442443092, 5688296579514244

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Example

Some solutions for n=4:
..6....6....4....1....4....4....8....1....8....6....6....8....1....6....8....4
..4....4....5....5....8....2....4....7....2....8....2....2....3....4....2....5
..6....2....1....4....4....4....2....2....8....2....7....6....4....2....8....7
..8....8....8....6....8....8....8....6....4....8....1....4....8....6....6....8

Crossrefs

Column k=6 of A254218.

Sequence in context: A149094 A086344 A209084 * A304940 A068205 A241684

Adjacent sequences: A254213 A254214 A254215 * A254217 A254218 A254219

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Extensions

a(23)-a(25) from Alois P. Heinz, Jan 27 2015

Status

approved