A018995 Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite BPH = Beryllophosphate-H Na7K7 [ Be14P14O56 ] . 20 H2O.

3, 9, 42, 236, 1280, 6087, 32623, 190235, 1136383, 7203562, 48328561, 330930887, 2266788757, 15475719147, 105439268002

Offset

2,1

Links

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

International Zeolite Association, Database of Zeolite Structures, Structure Commissionof the International Zeolite Association, revised 2017.

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

Same beginning as A018965, but may disagree later.

Cf. A018965. [R. J. Mathar, Oct 26 2008]

Sequence in context: A264521 A001427 A020128 * A018965 A357703 A105804

Adjacent sequences: A018992 A018993 A018994 * A018996 A018997 A018998

Keyword

nonn,more

Author

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

Extensions

a(11)-a(16) from Sean A. Irvine, Mar 17 2019

Status

approved