|
| |
|
|
A059775
|
|
From solution to a counting problem.
|
|
0
| |
|
|
0, 24, 120, 360, 824, 1664, 2992, 5000, 7848, 11808, 17024, 23888, 32576, 43432, 56816, 73136, 92616, 115872, 143104, 174928, 211808, 254312, 302680, 357832, 420136, 490232, 568664, 656360, 753496, 861376, 980232, 1111016, 1254504
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
REFERENCES
| D. Constales, Solution to Problem 10540, Amer. Math. Monthly, 108 (Feb. 200), 172-173.
|
|
|
MAPLE
| [seq(n*(n-1)*(n^2-n-1) + 4*add(floor(n/k^2)*phi(k), k=2..floor(sqrt(n))) - 2*add(floor(n/k)^2*phi(k), k=2..n), n=2..30)];
|
|
|
CROSSREFS
| Sequence in context: A198438 A114200 A069074 * A052762 A099317 A052760
Adjacent sequences: A059772 A059773 A059774 * A059776 A059777 A059778
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 21 2001
|
| |
|
|
