A343169 - OEIS

%I #11 Apr 20 2021 07:46:16

%S 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,

%T 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,

%U 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

%N Number of sporadic maximal rational-angle line configurations with n lines, up to equivalence.

%C In dimensions 3 through 6 there are also one- or two-parameter families of solutions.

%C a(n) = 0 for n > 15, except a(aleph-0) = 1 (the perpendicular configuration).

%H K. S. Kedlaya, A. Kolpakov, B. Poonen, and M. Rubinstein, <a href="https://arxiv.org/abs/2011.14232">Space vectors forming rational angles</a>, arXiv preprint arXiv:2011.14232 [math.MG], 2020.

%K nonn

%O 3,2

%A _N. J. A. Sloane_, Apr 20 2021