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Number of interior points that are the intersections of exactly two chords in the configuration A006561(n).
9

%I #26 Jul 19 2024 11:33:45

%S 0,0,0,1,5,12,35,40,126,140,330,228,715,644,1365,1168,2380,1512,3876,

%T 3360,5985,5280,8855,6144,12650,11284,17550,15680,23751,13800,31465,

%U 28448,40920,37264,52360,42444,66045,60648,82251,75720,101270,75012,123410,114400,148995,138644,178365,152064

%N Number of interior points that are the intersections of exactly two chords in the configuration A006561(n).

%H Seiichi Manyama, <a href="/A292104/b292104.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..120 from Scott R. Shannon)

%Y Cf. A006561. Column k=2 of A292105.

%K nonn

%O 1,5

%A _N. J. A. Sloane_, Sep 14 2017

%E a(31)-a(48) from _Scott R. Shannon_, Mar 04 2022