A258625 Number of length n 1..(2+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7

2, 6, 18, 50, 105, 181, 316, 560, 969, 1777, 3699, 8370, 18297, 36978, 73912, 155816, 335928, 697052, 1360137, 2539247, 4757378, 9452951, 20357207, 46362252, 107298090, 244529803, 538892048, 1146917302, 2392827002, 4981802096

Offset

1,1

Comments

Column 2 of A258631

Links

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

Example

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

Crossrefs

Cf. A258631

Sequence in context: A059413 A256828 A197055 * A062026 A048495 A089380

Adjacent sequences: A258622 A258623 A258624 * A258626 A258627 A258628

Keyword

nonn

Author

R. H. Hardin, Jun 06 2015

Status

approved