A292104 - OEIS

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A292104

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

14

0, 0, 0, 1, 5, 12, 35, 40, 126, 140, 330, 228, 715, 644, 1365, 1168, 2380, 1512, 3876, 3360, 5985, 5280, 8855, 6144, 12650, 11284, 17550, 15680, 23751, 13800, 31465, 28448, 40920, 37264, 52360, 42444, 66045, 60648, 82251, 75720, 101270, 75012, 123410, 114400, 148995, 138644, 178365, 152064

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000 (terms 1..120 from Scott R. Shannon)

N. J. A. Sloane, Summary table for vertices and regions in regular n-gon with all chords drawn, for n = 3..19. [V = total number of vertices (A007569), V_i (i>=2) = number of vertices where i lines cross (A292105, A292104, A101363); R = total number of cells or regions (A007678), R_i (i>=3) = number of regions with i edges (A331450, A062361, A067151).]

CROSSREFS

Cf. A006561. Column k=2 of A292105.

Sequence in context: A385673 A333886 A192243 * A136113 A298992 A050189

Adjacent sequences: A292101 A292102 A292103 * A292105 A292106 A292107

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 14 2017

EXTENSIONS

a(31)-a(48) from Scott R. Shannon, Mar 04 2022

STATUS

approved