A290726 a(n) = maximal number of semicircles that pass through an intersection point in the configuration A290447(n).

1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12

Offset: 1

Author

N. J. A. Sloane, Aug 10 2017

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..190
• M. F. Hasler, Illustration for A290447(9) = 124. (First instance where a triple intersection occurs, whence a(9) = 3.)

Crossrefs

Cf. A290447.

Extensions

More terms from Chai Wah Wu, Aug 10 2017