This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A174936 a(n) = Sum_{d|n} A007955(d) * A007955(n/d), where A007955(m) = product of divisors of m. 0
 1, 4, 6, 20, 10, 84, 14, 160, 63, 220, 22, 3648, 26, 420, 480, 2368, 34, 11988, 38, 16480, 924, 1012, 46, 671424, 275, 1404, 1620, 44800, 58, 1621860 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE For n = 4, A007955(n) = b(n): a(4) = b(1)*b(4/1) + b(2)*b(4/2) + b(4)*b(4/4) = 1*8 + 2*2 + 8*1 = 20. CROSSREFS Sequence in context: A013126 A012969 A057789 * A123169 A205955 A023863 Adjacent sequences:  A174933 A174934 A174935 * A174937 A174938 A174939 KEYWORD nonn AUTHOR Jaroslav Krizek, Apr 02 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 14 15:08 EST 2019. Contains 329979 sequences. (Running on oeis4.)