The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A343169 Number of sporadic maximal rational-angle line configurations with n lines, up to equivalence. 0
 0, 228, 29, 22, 0, 5, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,2 COMMENTS In dimensions 3 through 6 there are also one- or two-parameter families of solutions. a(n) = 0 for n > 15, except a(aleph-0) = 1 (the perpendicular configuration). LINKS K. S. Kedlaya, A. Kolpakov, B. Poonen, and M. Rubinstein, Space vectors forming rational angles, arXiv preprint arXiv:2011.14232 [math.MG], 2020. CROSSREFS Sequence in context: A092324 A122976 A098245 * A190027 A090943 A252451 Adjacent sequences:  A343166 A343167 A343168 * A343170 A343171 A343172 KEYWORD nonn AUTHOR N. J. A. Sloane, Apr 20 2021 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 September 24 21:05 EDT 2021. Contains 347651 sequences. (Running on oeis4.)