A018946 Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AEL = AlPO4-11 [ Al20P20O80 ].

1, 13, 27, 250, 1027, 7325, 41828, 286471, 1880024, 13073044, 90717167, 642317301, 4569527100, 32812863245, 236942593847

Offset

2,2

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.

Crossrefs

Sequence in context: A041334 A146380 A146372 * A042397 A041336 A145417

Adjacent sequences: A018943 A018944 A018945 * A018947 A018948 A018949

Keyword

nonn

Author

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

Extensions

a(11)-a(16) from Sean A. Irvine, Mar 01 2019

Status

approved