A018990 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 T2 atom.

0, 10, 20, 244, 1028, 7831, 45586, 320653, 2114588, 14817954, 102950126, 731851644, 5225037928, 37735447458, 274238573658

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: A038693 A217318 A239237 * A280882 A335802 A319599

Adjacent sequences: A018987 A018988 A018989 * A018991 A018992 A018993

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