0,3

The terms for n>5 are only conjectures supported by extensive computations.

For list of references given by E. Specht, see corresponding link.

Table of n, a(n) for n=0..12.

E. Specht, The best known packings of equal circles in the unit circle

Cf. A084618, A084617, A084644.

Cf. A201993 (conjectured lower bounds for a(n)).

Sequence in context: A105881 A060191 A178899 * A084619 A236478 A106906

Adjacent sequences: A023390 A023391 A023392 * A023394 A023395 A023396

more,nonn,hard

David W. Wilson

Terms for n>5 from Hugo Pfoertner, Jun 01 2003

Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Feb 18 2004, writes to suggest that the sequence probably continues 138, 161, 187, 213, 242, 272, 304, 337, 373, 413, 451, 495, ...

Edited by N. J. A. Sloane at the suggestion of David W. Wilson, Sep 22 2007

Offset corrected by Jon E. Schoenfield, Oct 12 2008

approved