A018980 Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite APD = AlPO4-D [ Al16P16O64 ].

2, 7, 25, 155, 1109, 6599, 41916, 268294, 1804922, 12288435, 84812079, 591842347, 4174903242, 29718998597, 213198431987

Offset

2,1

Links

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

Database of Zeolite Structures, Structure Commission of 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 [Subscription required].

Crossrefs

Sequence in context: A358498 A339515 A323658 * A012990 A137102 A294681

Adjacent sequences: A018977 A018978 A018979 * A018981 A018982 A018983

Keyword

nonn,more

Author

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

Extensions

a(11)-a(16) from Sean A. Irvine, Mar 12 2019

Status

approved