A019015 Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ERI = Erionite (Na2,Ca..)3.5 K2 [ Al9Si27O72 ] . 27 H2O.

3, 8, 49, 259, 1478, 7448, 38788, 219569, 1333733, 8486181, 55791794, 375324308, 2564288273, 17682410960, 122670267805

Offset

2,1

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: A146161 A304698 A306598 * A305217 A316797 A000862

Adjacent sequences: A019012 A019013 A019014 * A019016 A019017 A019018

Keyword

nonn,more

Author

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

Extensions

a(11)-a(16) from Sean A. Irvine, Mar 20 2019

Status

approved