login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092274 Sum_{k=2..n} min(k,n-k)*phi(k)*(n-k). 0
0, 0, 0, 1, 6, 16, 38, 70, 124, 200, 314, 452, 644, 890, 1216, 1592, 2068, 2624, 3312, 4094, 5042, 6138, 7438, 8844, 10488, 12348, 14496, 16796, 19422, 22314, 25590, 29158, 33168, 37530, 42400, 47526, 53204, 59356, 66132, 73226, 81004, 89338, 98436, 108086, 118582 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

REFERENCES

J. O'Rourke, Art Gallery Theorems and Algorithms, Oxford Univ. Press, 1987, p. 222.

CROSSREFS

Sequence in context: A064602 A058272 A049712 * A130902 A009955 A160255

Adjacent sequences:  A092271 A092272 A092273 * A092275 A092276 A092277

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Feb 17 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 04:18 EST 2012. Contains 205860 sequences.