login
A268266
Number of length-(7+1) 0..n arrays with new repeated values introduced in sequential order starting with zero.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2016
STATUS
approved