A254213 Number of length n 1..(3+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

2, 0, 3, 4, 8, 6, 15, 18, 45, 118, 553, 1706, 2845, 2970, 4470, 9426, 30908, 115084, 350693, 804152, 1724453, 3598260, 6467166, 12292306, 36973565, 137754308, 493838258, 1570992174, 4107583256, 8556975584, 14790344176, 23129972292

Offset

1,1

Links

Alois P. Heinz, Table of n, a(n) for n = 1..150 (first 34 terms from R. H. Hardin)

Example

All solutions for n=4:
..1....1....4....1
..3....5....2....3
..2....3....3....5
..4....1....1....1

Crossrefs

Column k=3 of A254218.

Sequence in context: A283528 A336972 A110990 * A321171 A336973 A369017

Adjacent sequences: A254210 A254211 A254212 * A254214 A254215 A254216

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved