A121847 The spiral parameter alpha for the icosahedral fullerenes C_n.

0, 5, 6, 15, 17, 31, 30, 33, 51, 50, 54, 77, 76, 75, 80, 107, 106, 105, 143, 142, 111

Offset

20,2

References

P. W. Fowler and K. M. Rogers, "Spiral Codes and Goldberg Representations of Icosahedral Fullerenes and Octahedral Analogues", J. Chem. Inf. Comput. Sci., vol. 41 (2001) 108-111.

Links

Table of n, a(n) for n=20..40.

Example

If n=80 then alpha is 6.
If n=500 then alpha is 54.

Crossrefs

Sequence in context: A160109 A351172 A191213 * A030533 A329634 A227066

Adjacent sequences: A121844 A121845 A121846 * A121848 A121849 A121850

Keyword

nonn,uned

Author

Parthasarathy Nambi, Aug 29 2006

Status

approved