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

1,4

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.

Sequence in context: A184349 A290573 A218085 * A090663 A111890 A104277

Adjacent sequences: A290723 A290724 A290725 * A290727 A290728 A290729

Keyword

nonn

Author

N. J. A. Sloane, Aug 10 2017

Extensions

More terms from Chai Wah Wu, Aug 10 2017

Status

approved