A018991 Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATV = AlPO4-25 [Al12P12O48] starting with a T1 atom.

1, 13, 24, 258, 1022, 7596, 43227, 302017, 1981321, 13868444, 96259499, 683882847, 4878916960, 35208994656, 255674262459

Offset

2,2

Links

Table of n, a(n) for n=2..16.

Georg Thimm, Cycle sequences of crystal structures.

Georg Thimm, Personal website (archived).

Georg Thimm, A graph theoretical approach to the analysis, comparison, and enumeration of crystal structures, Dissertation, Goethe University Frankfurt, Germany, 2008.

Georg Thimm and W. E. Klee, Zeolite cycle sequences, Zeolites, 19(5-6) (1997), 422-424.

Crossrefs

Sequence in context: A189325 A053080 A014357 * A018948 A256475 A335374

Adjacent sequences: A018988 A018989 A018990 * A018992 A018993 A018994

Keyword

nonn,more

Author

Georg Thimm (mgeorg(AT)ntu.edu.sg)

Extensions

a(11)-a(16) from Sean A. Irvine, Mar 16 2019

Status

approved