A254215 Number of length n 1..(5+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

3, 2, 12, 24, 70, 192, 633, 2484, 10554, 35054, 102520, 337948, 1366804, 6000028, 24951622, 94266262, 337342046, 1263530794, 5269371063, 23209051416, 98571237345, 383041820280, 1353435250769, 4542413798878, 16490190511798, 76615460665948, 434914649543770

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Example

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

Crossrefs

Column k=5 of A254218.

Sequence in context: A361865 A356857 A086551 * A007214 A189736 A025232

Adjacent sequences: A254212 A254213 A254214 * A254216 A254217 A254218

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Extensions

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

Status

approved