A258626 Number of length n 1..(3+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7

3, 12, 45, 130, 331, 834, 2115, 5726, 16873, 50003, 142116, 400694, 1157686, 3355089, 9458656, 26092189, 72995360, 213171551, 647222852, 1987679608, 6016219942, 17773719595, 51564943489, 148469880307, 426108755766, 1217647287273

Offset

1,1

Comments

Column 3 of A258631

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=8
..2....3....4....2....2....2....3....3....3....2....2....4....3....3....2....2
..2....3....2....1....2....1....4....2....1....1....2....2....3....1....1....3
..3....1....4....2....2....3....3....3....2....4....1....1....1....4....1....2
..1....1....4....2....2....2....2....4....2....3....4....1....3....4....2....1
..1....1....4....2....4....2....3....2....4....4....3....2....4....2....2....1
..1....3....2....1....3....2....1....1....2....4....3....2....2....2....4....3
..4....2....1....2....3....3....2....1....1....3....3....4....2....2....4....4
..4....2....4....2....4....3....2....4....1....1....2....4....3....2....4....2

Crossrefs

Cf. A258631

Sequence in context: A339066 A260146 A229936 * A064017 A005320 A062561

Adjacent sequences: A258623 A258624 A258625 * A258627 A258628 A258629

Keyword

nonn

Author

R. H. Hardin, Jun 06 2015

Status

approved