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A018984
Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATO = AlPO4-31 [ Al18P18O72 ].
0
1, 9, 48, 180, 1322, 6853, 43804, 283623, 1885015, 13026464, 90977470, 644191249, 4594696120, 32969721835, 237966662872
OFFSET
2,2
REFERENCES
G. Thimm and W. E. Klee, Zeolite cycle sequences, Zeolites, 19, pp. 422-424, 1997.
CROSSREFS
Sequence in context: A286437 A212107 A073979 * A055582 A359175 A054460
KEYWORD
nonn,more
AUTHOR
Georg Thimm (mgeorg(AT)ntu.edu.sg)
EXTENSIONS
a(11)-a(16) from Sean A. Irvine, Mar 13 2019
STATUS
approved