A268266 Number of length-(7+1) 0..n arrays with new repeated values introduced in sequential order starting with zero.

129, 1918, 18804, 126591, 619490, 2377935, 7594224, 21042479, 52119726, 117925215, 247685420, 488872479, 915404154, 1638353711, 2819638440, 4689195855, 7566196934, 11884886079, 18225677796, 27352180415, 40254857490

Offset

1,1

Comments

Row 7 of A268261.

Links

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

Formula

Empirical: a(n) = n^8 + n^7 + 7*n^6 + 6*n^5 + 30*n^4 + 20*n^3 + 50*n^2 + 20*n + 15 for n>2

Example

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

Crossrefs

Cf. A268261.

Sequence in context: A329727 A209532 A233305 * A230187 A240417 A353940

Adjacent sequences: A268263 A268264 A268265 * A268267 A268268 A268269

Keyword

nonn

Author

R. H. Hardin, Jan 29 2016

Status

approved