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A292103 Number of points that are the intersections of exactly two semicircles in the configuration A290447(n). 0
0, 0, 0, 1, 5, 15, 35, 70, 123, 195, 285, 420, 586, 818, 1110, 1451, 1846, 2361, 2956, 3704, 4567, 5530, 6631, 7963, 9443, 11113, 13005, 15111, 17450, 20167, 23064, 26396, 30053, 34046, 38447, 43230, 48245, 53890, 60061, 66703, 73713, 81503, 89746 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

No formula or recurrence is known.

Needs a b-file (A290867 gives first 100 terms).

LINKS

Table of n, a(n) for n=1..43.

CROSSREFS

Cf. A290447, A292104.

Column k=2 of triangle in A290867.

Sequence in context: A069983 A005894 A015622 * A290447 A000750 A289389

Adjacent sequences:  A292100 A292101 A292102 * A292104 A292105 A292106

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 14 2017

STATUS

approved

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Last modified February 24 03:21 EST 2018. Contains 299595 sequences. (Running on oeis4.)