A248839 Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 5 times

2, 6, 24, 120, 720, 5038, 40260, 361636, 3606044, 39517182, 472002456, 6102356222, 84896359836, 1264499036118, 20075760897736, 338430468325576, 6037037185793372, 113608224705704476, 2249252806749536964

Offset

1,1

Comments

Column 5 of A248842

Links

R. H. Hardin, Table of n, a(n) for n = 1..136

Example

Some solutions for n=6
..1....1....0....1....0....1....1....1....0....0....0....1....1....0....0....1
..2....2....2....2....2....1....1....0....2....1....2....2....1....2....2....0
..3....3....0....2....1....3....0....1....0....0....1....0....2....3....0....0
..2....1....2....1....0....4....0....3....0....2....1....1....3....2....1....4
..1....4....4....5....1....2....2....2....5....0....4....4....5....2....0....3
..0....0....2....2....5....3....4....0....5....4....1....4....0....0....5....6

Crossrefs

Sequence in context: A177534 A164873 A226438 * A052399 A177553 A090583

Adjacent sequences: A248836 A248837 A248838 * A248840 A248841 A248842

Keyword

nonn

Author

R. H. Hardin, Oct 15 2014

Status

approved